We have recently published blood pressure (BP) percentiles
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1 Blood Pressure Differences by Ethnic Group Among United States Children and Adolescents Bernard Rosner, Nancy Cook, Ron Portman, Steve Daniels, Bonita Falkner Abstract Large differences in blood pressure (BP) by ethnic group are apparent among adults. There is uncertainty as to whether similar differences by ethnic group exist among children and, if so, the age of onset. BP measurements were obtained from children at visits using Pediatric Task Force data, a collection of 11 studies with BP data from children and adolescents age 1 to 17 years. Generalized estimating equation methods were used to identify sex-specific differences in body mass index (BMI) adjusted rates of BP elevation and prehypertension by ethnic group. Significant BMI-adjusted differences in rates of BP elevation were found between Hispanic versus white (odds ratio: 1.21; 95% CI: 1.07 to 1.37; P 0.002). No overall significant differences were found between black versus white (odds ratio: 1.03; 95% CI: 0.95 to 1.12; P 0.49); however, there was significant effect modification (P 0.01) with significant differences found for normal-weight (BMI: 85th percentile; black versus white: 1.14; 95% CI: 1.03 to 1.27; P 0.01) but not for overweight (BMI: 85th percentile; black versus white: 0.90; 95% CI: 0.78 to 1.05; P 0.20). No overall ethnic group differences in BMI-adjusted rates of hypertension were found for. Ethnic differences in prevalence rates of pediatric BP elevation that are not explained by obesity are present, primarily in. Whether these differences are attributable to genetic or environmental factors is unknown. (Hypertension. 2009;54: ) Key Words: blood pressure hypertension pediatrics Pediatric Task Force prehypertension We have recently published blood pressure (BP) percentiles in normal-weight children that are adjusted for age, sex, and height. 1 The analyses were based on children in the Pediatric Task Force database with body mass index (BMI) 85th percentile for a given age-sex group. Percentiles were obtained using quantile regression methods that were to found to fit the data better than the previously used polynomial regression methods. The percentiles are slightly lower than previously published task force levels, 2 which included both normal-weight and overweight children in the normative database. We define a prehypertensive child as one whose systolic BP (SBP) or diastolic BP (DBP) is 95th percentile and either 90th percentile or at or more than the adult threshold for prehypertension, which is 120/ 80 mm Hg. BP elevation in children is defined as SBP and/or DBP 95th percentile. An important issue in pediatric hypertension is whether prevalence varies by ethnic group. There are clear differences in the prevalence of hypertension by ethnic group in adults, 3 but results in children are more equivocal. A previous article by our group 4 compared black and white children using task force data based on polynomial regression methods. Slight differences in mean BP were found between adolescent black versus white that were mediated by BMI differences; no differences in mean BP were found between white and black. In the present report, we revisit these analyses using quantile regression methods, because these were shown to be more accurate than polynomial regression methods. The latter assume that the effect of height z score is the same for all ages and that distributions of pediatric BP are normally distributed, neither of which appear to be true for pediatric BP data. We use quantile regression methods with effects of age, height, and age height represented by cubic splines to estimate percentiles, and we expanded the investigation by including Hispanic children as well. These methods provide for a more flexible response function relating BP to age and height and do not make assumptions of normality of residuals because separate sex-specific functions are used for each percentile. More details concerning these methods are provided elsewhere. 1 Methods The data set used for this analysis consisted of all of the children in the Pediatric Task Force database. 2 Normative data for BP as a function of age, sex, and height have been determined for normalweight children. Normal-weight children are defined as children whose BMI is 85th percentile for their age and sex on the basis of 2000 Centers for Disease Control and Prevention growth charts. 5 BP percentiles as a function of age, sex, and height for normal-weight Received April 2, 2009; first decision April 29, 2009; revision accepted June 25, From the Channing Laboratory (B.R., N.C.), Brigham and Women s Hospital and Harvard Medical School, Boston, Mass; University of Texas at Houston Medical School (R.P.), University of Texas, Houston, Tex; University of Colorado at Denver and Health Sciences Center (S.D.), University of Colorado, Denver, Colo; Department of Medicine (B.F.), Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pa. Correspondence to Bernard Rosner, Channing Laboratory, 181 Longwood Ave, Boston, MA bernard.rosner@channning.harvard.edu 2009 American Heart Association, Inc. Hypertension is available at DOI: /HYPERTENSIONAHA
2 Rosner et al BP Differences by Ethnic Group Among US Children 503 Table 1. Ethnic and Demographic Data By Study Population, Pediatric Task Force Data Sex Ethnic Group No. of Persons No. of Persons (No. of Visits) (No. of Visits) Total No. of Source Time Period Age, y Boys Girls White Black Hispanic With SBP Available With DBP Available Persons (No. of Visits) NHANES II to (3563) 3526 (3526) 3563 (3563) Pittsburgh, Pa to (890) 0 (0) 284 (890) Dallas, Tex 8, to (21 859) (21 851) (21 859) Bogalusa to (15 880) 0 (0) 7358 (15 880) Houston, Tex to (2725) 0 (0) 2725 (2725) South Carolina to (6423) 6362 (6362) 6423 (6423) Iowa 15, to (4091) 0 (0) 4091 (4091) Providence, RI to (894) 369 (556) 459 (894) Minnesota (Sodium-Potassium Blood Pressure Trial in Children) to (15 283) (15 127) (15 283) NHANES III to (4918) 4202 (4202) 4918 (4918) NHANES to (2030) 2002 (2002) 2030 (2030) Total NA 1 to (51%) (49%) (59%) (31%) 6288 (11%) (78 556) (53 626) (78 556) NA indicates not applicable; NHANES, National Health and Nutrition Examination Survey. children are available elsewhere ( Pediatrics.html). The goal of the present article was to compare rates of prehypertension and BP elevation among white, black and Hispanic children in the Pediatric Task Force database. Ethnic group was obtained by self-report. These analyses included both normal-weight (BMI: 85th percentile) and overweight (BMI: 85th percentile) children with BP standards based on normal-weight children. We defined SBP elevation as SBP 95th percentile for a child s age, sex, and height. A similar criterion was used with DBP (K5 [5th Korotkoff sound]) for DBP elevation. In addition, we defined overall BP elevation as 95th percentile for either SBP or DBP. We defined systolic prehypertension as 95th percentile and either 90th percentile or 120 mm Hg. We defined diastolic prehypertension as 95th percentile and either 90th percentile or 80 mm Hg. We defined overall prehypertension as either systolic prehypertension or diastolic prehypertension and no overall BP elevation. All of the analyses were performed separately for and. Because there were systematic differences among studies even after accounting for age, sex, height, and BMI, we used study-corrected BPs in the analyses, as described previously. 1 Because some subjects had BP measured at multiple visits, we used generalized estimating equations with a logit link based on PROC GENMOD (SAS Institute) to relate the presence of prehypertension or BP elevation at a particular visit to an ethnic group with and without adjusting for BMI using the following model: log p ij /(1 p ij ) 1 x i1 2 x i2 z ij (1) where p ij probability of BP elevation (or prehypertension) for the ith child at the jth visit; x i1 1 if subject i is black or x i1 0 otherwise; x i2 1 if subject i is Hispanic or x i2 0 otherwise; and z ij BMI for the ith subject at the jth visit. To assess effect modification of ethnicity by BMI, we also considered generalized estimating equation models of BP elevation (or prehypertension) on ethnicity, BMI, and ethnicity BMI given as follows: log[p ij /(1 p ij ) A 1A x i1 2A x i2 3A v ij 4A x i1 v ij 5A x i2 v ij A z ij (2) where v ij 1 if the ith subject is overweight at the jth visit and v ij 0 otherwise. 4A and 5A represent interaction effects of overweight by black and Hispanic ethnicity, respectively. To assess effects of ethnicity within (overweight/normal weight) subgroups we fit the model as follows: log p ij /(1 p ij ) B 0 v ij 1B x i1 v ij 1C x i1 (1 v ij ) 2B x i2 v ij 2C x i2 (1 v ij ) B z ij (3) The coefficients 1B, 2B and 1C, 2C represent effects of black and Hispanic ethnicity versus white ethnicity for overweight and normalweight children, respectively. To assess differences in overweight prevalence by ethnic group we fit the following model: log p ij */(1 p ij *) C 1 x i1 2 x (4) i2 where p ij * probability (overweight) for the ith subject at the jth visit. To assess the effect of overweight status on the prevalence of BP elevation or prehypertension within specific ethnic groups we fit the following model: log p ij /(1 p ij ) D 1D x i1 2D x i2 1D v ij (1 x i1 )(1 x i2 ) 2D v ij x i1 3D v ij x i2 (5) Results The demographic data for the database used in this study 6 20 are presented in Table 1. A total of children ages 1 to 17 years provided data at visits over 11 studies, of whom (51%) were and (49%) were. A total of (59%) of the children were white, (31%) were black, and 6288 (11%) were Hispanic. Diastolic BP was available for (74%) of the children at visits. Prevalence of BP elevation and prehypertension for SBP are presented by ethnic group, sex, and BMI group (normal weight: 85th percentile for BMI; overweight: 85th percentile for BMI) in Table 2. The data in Table 2 demonstrate that, for SBP, the odds of BP elevation were 2.9 to 3.6 times higher, and the odds of prehypertension were 1.8 to 2.2 times higher among overweight children versus normal-weight children for all of the ethnic and sex groups. The odds ratio () for BP elevation was slightly higher among overweight adolescents (ages 13 to
3 504 Hypertension September 2009 Table 2. Percentage of Prehypertensive and Hypertensive Children for SBP by BMI Percentile, Ethnic Group, and Sex Normal-Weight Children* Overweight Children Total Unadjusted BMI Adjusted Ethnic Group Visits Elevated % Visits Elevated % (95% CI) Visits Elevated % (95% CI) P (95% CI) P SBP hypertension White (2.84 to 3.54) (ref) 1.0 (ref) Black (2.63 to 3.58) (0.87 to 1.05) (0.83 to 1.00) 0.06 Hispanic (2.51 to 3.90) (1.31 to 1.68) (1.14 to 1.47) SBP, prehypertension White (1.82 to 2.18) (ref) 1.0 (ref) Black (1.56 to 1.98) (1.18 to 1.34) (1.13 to 1.30) Hispanic (1.51 to 2.23) (1.14 to 1.40) (0.94 to 1.17) 0.41 SBP hypertension White (2.62 to 3.31) (ref) 1.0 (ref) Black (2.54 to 3.37) (1.06 to 1.28) (0.91 to 1.09) 0.92 Hispanic (2.78 to 4.67) (1.08 to 1.43) (0.88 to 1.17) 0.82 SBP, prehypertension White (1.90 to 2.37) (ref) 1.0 (ref) Black (1.72 to 2.23) (1.11 to 1.30) (0.98 to 1.16) 0.11 Hispanic (1.71 to 2.79) (0.97 to 1.26) (0.83 to 1.08) 0.39 Prehypertensive is defined as 90th percentile or 120 mm Hg and 95th percentile; hypertensive, 95th percentile based on quantile regression methods. ref indicates reference group. is for SBP hypertension (prehypertension) for overweight vs normal-weight children. Data are based on Proc GENMOD (SAS Institute). 17 : 3.1 to 3.5) than among overweight children (ages 1 to 12 : 2.4 to 3.2). The for prehypertension was similar for children and adolescents (data not shown). Also, overweight prevalence was significantly higher among Hispanic (: 1.60; 95% CI: 1.47 to 1.75; P 0.001) and (: 1.80; 95% CI: 1.65 to 1.96; P 0.001) than their white peers (data not shown). Results for blacks differed by sex, with a lower overweight prevalence for black (: 0.83; 95% CI: 0.78 to 0.88; P 0.001) and a higher prevalence for black (: 1.30; 95% CI: 1.23 to 1.39; P 0.001) than their white peers. The prevalence of SBP elevation ranged from 7% to 10% among and 7% to 8% among. The prevalence of systolic prehypertension ranged from 13% to 16% among and 8% to 9% among. There were some differences in the prevalence of systolic prehypertension and BP elevation by ethnic group. For, the crude prevalence of SBP elevation was not significantly different between black and white (: 0.96; P 0.39). However, Hispanic had significantly higher prevalent SBP elevation rates than white (: 1.49; P 0.001). Both black and Hispanic had a significantly higher crude prevalence of SBP elevation than white (P 0.003). After adjusting for BMI, Hispanic continued to have a significantly higher prevalence of SBP elevation (: 1.29; 95% CI: 1.14 to 1.47; P 0.001), whereas black had a slightly lower prevalence of SBP elevation (: 0.91; 95% CI: 0.83 to 1.00; P 0.06) than white. For systolic prehypertension, significant BMI-adjusted differences were found between black and white (: 1.21; 95% CI: 1.13 to 1.30; P 0.001) but not between Hispanic and white. For, no significant differences in SBP elevation or prehypertension prevalence among ethnic groups remained after adjusting for BMI. Results for DBP are presented in Table 3. For DBP, the BMI-adjusted prevalence of BP elevation was significantly higher for both black (: 1.13; 95% CI: 1.01 to 1.26; P 0.04) and Hispanic (: 1.19; 95% CI: 1.01 to 1.40; P 0.04) compared with white. For, no significant difference between ethnic-specific prevalence of DBP elevation was found after adjusting for BMI. For diastolic prehypertension, significant BMIadjusted differences were found for black versus white (: 1.15; 95% CI: 1.03 to 1.29; P 0.01) but not between Hispanic and white. Hispanic had a slightly lower BMI-adjusted prevalence of diastolic prehypertension than white (: 0.82; 95% CI: 0.68 to 0.99; P 0.04). Results for overall BP elevation and prehypertension are given in Table 4. For, the crude prevalence of BP elevation was significantly higher for Hispanics versus whites (: 1.41; 95% CI: 1.25 to 1.59; P 0.001). After adjusting for BMI, Hispanic still had a higher prevalence of BP elevation (: 1.21; 95% CI: 1.07 to 1.37; P: 0.002). The BMIadjusted ethnic differences persisted when children (ages 1 to 12 years; Hispanic versus white : 1.39; 95% CI: 1.13 to 1.72; P 0.002) and adolescents (ages 13 to 17 years;
4 Rosner et al BP Differences by Ethnic Group Among US Children 505 Table 3. Percentage of Prehypertensive and Hypertensive Children for DBP by BMI Percentile, Ethnic Group, and Sex Normal Weight Children* Overweight Children Total Unadjusted BMI Adjusted Ethnic Group Visits Elevated % Visits Elevated % (95% CI) Visits Elevated % (95% CI) P (95% CI) P DBP hypertension White (1.96 to 2.67) (ref) 1.0 (ref) Black (1.32 to 1.94) (1.04 to 1.30) (1.01 to 1.26) 0.04 Hispanic (1.57 to 2.81) (1.12 to 1.55) (1.01 to 1.40) 0.04 DBP, prehypertension White (1.18 to 1.64) (ref) 1.0 (ref) Black (1.32 to 1.95) (1.06 to 1.32) (1.03 to 1.29) 0.01 Hispanic (0.80 to 1.55) (0.89 to 1.25) (0.82 to 1.15) 0.72 DBP hypertension White (2.26 to 3.02) (ref) 1.0 (ref) Black (2.03 to 2.80) (1.04 to 1.28) (0.92 to 1.14) 0.72 Hispanic (1.89 to 3.53) (0.88 to 1.24) (0.74 to 1.05) 0.15 DBP, prehypertension White (1.39 to 1.92) (ref) 1.0 (ref) Black (1.24 to 1.80) (0.91 to 1.14) (0.85 to 1.07) 0.47 Hispanic (1.09 to 2.15) (0.75 to 1.08) (0.68 to 0.99) 0.04 Prehypertensive is defined as 90th percentile or 80 mm Hg and 95th percentile; hypertensive, 95th percentile based on quantile regression methods. ref indicates reference group. is for DBP hypertension (prehypertension) for overweight vs normal-weight children. Data are based on Proc GENMOD (SAS Institute). Hispanic versus white : 1.16; 95% CI: 1.00 to 1.35; P 0.06) were analyzed separately (data not shown). No significant differences were seen between black and white either before or after adjusting for BMI. For, black had a significantly higher prevalence of BP elevation than white (: 1.17; 95% CI: 1.08 to 1.27; P 0.001), which became nonsignificant after adjusting for BMI (: 1.02; 95% CI: 0.94 to 1.11; P 0.61). No significant differences were seen between the prevalence of BP elevation for Hispanic versus white either with or without adjusting for BMI. For overall prehypertension, there were significant BMI-adjusted differences between black and white (: 1.32; 95% CI: 1.22 to 1.43; P 0.001) and (: 1.23; 95% CI: 1.11 to 1.37; P 0.001). No significant differences were found between Hispanic and white, but a slightly decreased risk of prehypertension was found for Hispanic versus white (: 0.80; 95% CI: 0.67 to 0.95; P 0.01). An assumption made in Tables 2 to 4 is that the differences between the prevalence of BP elevation and prehypertension by ethnic group are the same for all levels of BMI. In Table 5, we assess effect modification of ethnicity overweight status, and we estimate effects of ethnicity separately for normalweight and overweight children (see the Methods section for details of modeling). For, there was significant effect modification of black ethnicity by BMI for both BP elevation (P 0.01) and prehypertension (P 0.05). No significant effect modification was found for Hispanic ethnicity by BMI. For normal-weight (BMI: 85th percentile), the prevalence of BP elevation was significantly elevated for both black (: 1.14; 95% CI: 1.03 to 1.27; P 0.01) and Hispanic (: 1.18; 95% CI: 1.00 to 1.39; P 0.05). For overweight (BMI: 85th percentile), significant effects were seen for Hispanic (: 1.23; 95% CI: 1.02 to 1.48; P 0.03) but not for black (: 0.90; 95% CI: 0.78 to 1.05; P 0.20). Similar results were seen for prehypertension. For, no significant effect modification of ethnicity by BMI was found for BP elevation; however, for prehypertension, significant effects were seen for normal-weight black versus white (: 1.32; 95% CI: 1.17 to 1.49; P 0.001) but not for overweight (: 0.99; 95% CI: 0.82 to 1.21; P 0.93; P for interaction 0.01). Discussion For overweight children (BMI 85th percentile), the odds of prehypertension increased 50%, and the odds of BP elevation increased 2- to 3-fold in all of the race/ethnic groups compared with normal-weight children. Ethnic differences in the prevalence of both BP elevation and prehypertension were identified even after controlling for BMI. Hispanic, both normal weight and overweight, had a significantly higher prevalence of BP elevation (SBP and/or DBP 95th percentile) compared with white. Hispanic also had a significantly higher prevalence of BP elevation when SBP and DBP were considered separately. The prevalence of BP elevation was significantly higher in normal-weight black
5 506 Hypertension September 2009 Table 4. Percentage of Hypertensive and Prehypertensive Children by BMI Percentile, Ethnic Group, and Sex Normal Weight Children* Overweight Children Total Unadjusted BMI Adjusted Ethnic Group Visits Elevated % Visits Elevated % (95% CI) Visits Elevated % (95% CI) P (95% CI) P Hypertension, White (2.43 to 3.04) (ref) 1.0 (ref) Black (1.95 to 2.59) (0.99 to 1.17) (0.95 to 1.12) 0.49 Hispanic (2.35 to 3.61) (1.25 to 1.59) (1.07 to 1.37) Prehypertension, White (1.31 to 1.65) (ref) 1.0 (ref) Black (1.18 to 1.54) (1.27 to 1.47) (1.22 to 1.43) Hispanic (1.04 to 1.62) (1.10 to 1.39) (0.88 to 1.14) 1.00 Hypertension, White (2.57 to 3.22) (ref) 1.0 (ref) Black (2.46 to 3.18) (1.08 to 1.27) (0.94 to 1.11) 0.61 Hispanic (2.67 to 4.32) (0.97 to 1.25) (0.79 to 1.03) 0.14 Prehypertension, White (1.51 to 2.05) (ref) 1.0 (ref) Black (1.33 to 1.82) (1.26 to 1.54) (1.11 to 1.37) Hispanic (1.24 to 2.38) (0.81 to 1.14) (0.67 to 0.95) 0.01 Hypertension is defined as 95th percentile for either SBP or DBP based on quantile regression methods; prehypertension, either systolic or diastolic prehypertension and not hypertensive. Data are based on Proc GENMOD (SAS Institute). is for hypertension (prehypertension) for overweight vs normal-weight children. than their white counterparts but was similar in overweight black and white. These results persisted when children (ages 1 to 12 years) and adolescents (ages 13 to 17 years) were considered separately. Results for prehypertension differed somewhat, with a higher prevalence observed for black (but not Hispanic ) as compared with white, especially among normal-weight. The race/ ethnic disparity in BP was much less apparent among. Because BMI was higher on average in both black and Hispanic, after adjusting for BMI there was no difference in the prevalence of BP elevation among the 3 race/ethnic groups. These results on the prevalence of BP elevation among race/ethnic groups in childhood are different than the data on prevalence of hypertension across race/ethnic groups in adults. The prevalence of obesity among patients with hypertension is much higher than the population prevalence of Table 5. Effect Modification of the Association Among Hypertension, Prehypertension, and Ethnicity by BMI, Pediatric Task Force Data Boys Normal Weight* Overweight Normal Weight* Overweight Ethnic Group (95% CI) P (95% CI) P P, Interaction (95% CI) P (95% CI) P P, Interaction Hypertension White 1.0 (ref) 1.0 (ref) 1.0 (ref) 1.0 (ref) Black 1.14 (1.03 to 1.27) (0.78 to 1.05) (0.97 to 1.20) (0.85 to 1.11) Hispanic 1.18 (1.00 to 1.39) (1.02 to 1.48) (0.70 to 1.01) (0.79 to 1.16) Prehypertension White 1.0 (ref) 1.0 (ref) 1.0 (ref) 1.0 (ref) Black 1.28 (1.17 to 1.39) (0.83 to 1.25) (1.17 to 1.49) (0.82 to 1.21) Hispanic 1.06 (0.92 to 1.23) (0.64 to 1.08) (0.66 to 1.02) (0.55 to 0.99) Hypertension is defined as 95th percentile for either SBP or DBP based on quantile regression methods; prehypertension, either systolic or diastolic prehypertension and not hypertensive. Data are based on Proc GENMOD (SAS Institute). P value is for interaction of ethnicity normal weight/overweight. Girls
6 Rosner et al BP Differences by Ethnic Group Among US Children 507 obesity. In addition to the obesity-hypertension relationship in adults, there appears to be an added effect of race or ethnicity. Similarly, fat patterning, as characterized by waist: hip ratio, does not explain the racial differences in hypertension among adults. 21 A limitation of the current study is that waist:hip ratio was not available for the task force database. Data on adults from the National Health and Nutrition Examination Survey 3 show that blacks have the highest prevalence of hypertension at 37.8% in men and 40.3% in women; the prevalence of hypertension in Hispanic men (22.1%) is somewhat lower than in white men at 26.0%. The prevalence of hypertension is nearly equivalent in white (21%) and Hispanic (21.6%) adult women. Although adult blacks, both men and women, have the highest prevalence of hypertension, our data show that, in children, Hispanic had the highest prevalence of elevated BP, although black had the highest rate of prehypertension. Overweight prevalence was highest among Hispanic and compared with the other race/ethnic groups. However, even among the normal-weight children the rates of BP elevation were highest among Hispanic compared with other race/ethnicity (and sex) groups. When the rates of BP elevation were compared in, the rates were only slightly higher in black, and this is because of somewhat greater rates of DBP elevation. Although the explanation for this race/ethnicity difference between childhood and adulthood is uncertain, these findings could indicate an emerging trend toward increasing risk for hypertension and subsequent cardiovascular disease among Hispanic children as they age into adulthood. Because the 95th percentile of the BP distribution is used to define BP elevation, the prevalence of high BP is expected to be 5% among normal-weight children on the basis of a single measurement in this group. 1,2 Our results on the prevalence of both SBP and DBP elevation in normal-weight children are close to the expected 5%. The prevalences of both BP elevation and prehypertension clearly increased among the overweight groups in all 3 of the ethnic groups, both and. One limitation of our study is that the data were drawn from several epidemiological surveys on healthy children mostly from the 1970s and 1980s. Thus, the data used in this analysis were obtained before the current childhood obesity epidemic that is now well established. 22 Considering the increasing overall prevalence of obesity in the childhood population and the evidence that the prevalence of BP elevation is higher in obese children, it would be expected that the current prevalence of BP elevation would be higher than the prevalence for the earlier sample that was used in this analysis. The results reported here are similar to the results of a study to determine the effect of increasing BMI on BP among children in primary care pediatric practices. 23 In that study, electronic medical chart data were analyzed on children between 2 and 19 years of age. The effect of increasing BMI on both BP level and the prevalence of BP elevation was significant in both and, although no analysis by ethnic group was reported. The prevalence of BP elevation among normal-weight and was also close to 5%, with a substantially higher prevalence of BP elevation in the overweight groups. An analysis of the trends in childhood BP from 2 sequential national cross-sectional studies identified a significant increase in both SBP and DBP. The BP increase was most significant among minority groups, which also have the highest rates of childhood obesity. 24 A second limitation of this study is that the ascertainment of prehypertension and BP elevation is based on only 1 BP measurement session. A designation of hypertension or prehypertension that uses a single BP measurement generally overestimates the prevalence, because BP tends to decrease in subsequent visits because of an accommodation effect and regression to the mean. 2 In clinical practice, an average SBP or DBP 95th percentile obtained on 3 separate visits is required for the clinical diagnosis of hypertension in childhood. Recent reports have demonstrated that, using these criteria, the prevalence of childhood hypertension is from 3.2% to 3.6%. 25,26 Considering a prevalence of 3.2% to 3.6%, hypertension can be considered one of the most common chronic diseases in childhood. Moreover, BP data from other studies indicate that a single BP measurement does provide important information regarding the risk of future BP elevation and cardiovascular disease. A recent systematic review and analysis of 50 cohort studies that examined BP tracking documented significant BP tracking correlation coefficients from childhood into adulthood. 27 The strength of the tracking increased with baseline age and decreased with follow-up length. The analysis concluded that data from diverse populations show that the evidence for BP tracking from childhood into adulthood is strong and that early intervention is important. The population evidence is substantial that BP measured in childhood predicts future BP with a tracking coefficient of 0.4 for SBP. 28 Perspectives Racial disparities in the prevalence of hypertension and prehypertension have been identified in adults and are also detectable in children. Some of the observed differences appear to be associated with population differences in overweight and obesity between the pediatric and adult populations. Data in this study demonstrate differences in BP elevation by race/ethnicity, particularly for after controlling for the effect of BMI, which appear to be different than data observed for adults. These differences may portend a different epidemiology of hypertension when these children and adolescents reach adulthood. As the prevalence of childhood obesity increases, the prevalence of high BP in childhood is expected to increase, especially among Hispanics, and to contribute to rising rates of premature cardiovascular disease. Acknowledgment We thank Marion McPhee for programming support for the analyses in this article. Sources of Funding This work was supported by National Institutes of Health grant HL
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