Bone Mineral Density of Healthy Turkish Children and Adolescents
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1 Journal of Clinical Densitometry, vol. 9, no., 8 90, 006 Ó Copyright 006 by The International Society for Clinical Densitometry /06/9:8 90/$.00 DOI: 0.06/j.jocd Original Article Bone Mineral Density of Healthy Turkish Children and Adolescents Damla Goksen,, Sukran Darcan, Mahmut Coker, and Timur Kose Ege University Faculty of Medicine Department of Pediatric Endocrinology and Metabolism, Bornova/ Izmir, _ Turkey; and Ege University Faculty of Computer Engineering, Bornova/ Izmir, _ Turkey Abstract The objective of this article is to gain reference values of lumbar and femoral neck bone mineral density (BMD) for healthy Turkish children. Three hundred forty-five children aged 8 years were examined. Weight and height development were normal for age according to national growth charts. Areal BMD (abmd) was corrected using the model of Kroger et al (9). The results of the lumbar and femoral abmd increased progressively from childhood to adulthood. Statistically significant correlation was found between lumbar and femoral neck abmd and age and height ( p! 0.0). Lumbar volumetric (vbmd) data were similar between males and females. Femoral vbmd was only significantly different at the ages of 8 and 6 ( p! 0.0) in girls and boys and did not increase with age. A significant increase in abmd L L values according to puberty was observed between all Tanner stages, except Tanner stages and ( p O 0.0). A significant difference was found between stages and, and and in femoral neck abmd ( p! 0.0). This data provides a tool for the investigation and follow-up of Turkish children at risk for low-bone mineralization. Key Words: Areal bone mineral density (abmd); volumetric bone mineral density (vbmd); children; adolescents. Introduction During childhood and adolescence, bone mineral density (BMD) increases until peak bone mass is reached. Age, weight, height, pubertal status, nutrition, physical activity level, and ethnicity are the factors that influence peak bone mass and BMD (,). Dual energy X-ray absorptiometry (DXA) is the method of choice to measure BMD allowing rapid assessment of low radiation dose with high precision and accuracy. In physical terms, bone mass depends on the size and the density of skeletal bone. It is not possible to measure true bone density by DXA because it measures only the crosssectional area of the scanned bone. True BMD is a function Received 0/8/0; Revised 06//00; 08/0/00; Accepted 08/0/0. Address correspondece to: Damla Goksen, Mithatpasxa cad No /, G uzelyalı/_izmir 90 Turkey. damla.goksen@ ege.edu.tr of the bone mineral content per volume of bone (). Correction of lumbar BMD for bone volume by the use of mathematical formulations reduces the effect of bone size during growth (). In some studies it has been shown that volumetric BMD (vbmd) remains dependent on age and bone size during growth, except prior to puberty when femoral neck vbmd is independent of age ( 9). Studies in healthy children using quantitative computed tomography (QCT) have shown that BMD of cortical bone is not influenced by age, anthropometric parameters, puberty, gender or race; however events during puberty are the major determinants of the increases in the cancellous bone density (0). In order to assess children and adolescents who are at risk for low bone mass, normative data based on large samples are required (). Several cross-sectional studies have presented normative data for children and adolescence, but these are limited with small sample size, they are specific to geographic areas, and they use different software programs (, 9). The objective of this study was to gain BMD reference values for the lumbar spine and femoral neck of healthy 8
2 BMD in Pediatrics 8 Caucasian Turkish children, and to evaluate the influence of age, nutrition, physical activity, weight, height, and pubertal status on these reference values. This normative BMD data provides information on children as young as years of age that can be used as reference values for children and adolescents based on age and pubertal status using the Hologic QDR 00A (Hologic, Bedford, MA) in the array mode, which will enable us to treat and follow-up these patients. Subjects and Methods A total of Caucasian children aged 8 years were examined (i.e., 76 girls and 69 boys). The participants were recruited from the primary and secondary schools of _Izmir, Turkey. The study protocol was approved by the ethics committee of the Ege University Medical Faculty. Written informed consent was obtained from individual participants if they were of legal adult age and from their parents if they were not. Children treated with oral corticosteroids, anticonvulsants, or heparin, or who suffered from metabolic bone disease (i.e., those who had a bone age of more or less than standard deviation (SD) from their chronological age, disease of the kidneys or liver, diabetes mellitus, and were small for their gestational age or were premature) were excluded from the study. Participants included in the study were between 0 90 percentile for height and weight according to Neyzi et al (0). A questionnaire was administered to all subjects to determine calcium and vitamin D intake, physical activity, medical history, low birth weight, and age at onset of puberty. The questions were asked to participants or to one of the parents if the child was less than years of age. A food frequency for the dietary intake of calcium (Ca) was obtained from each participant to estimate daily Ca intake (i.e., daily milk and milk product consumption of each child was asked, and Ca intake other than daily products, which is 0 mg/day for each child was added; Table ) (). Physical activity included physical classes and organized sports measured in min/wk in school-age children. In preschool-age children, organized sports were accepted as physical activity. Height was measured without shoes with a wall mounted Harpenden stadiometer (Holtain LTd., Crymych, UK). Weight was measured without shoes on a standard balance nearest to 0. kg. Pubertal development was evaluated according to the method of Tanner (), and bone age according to Greulich and Pyle () by the same pediatric endocrinologist in every child. Table Estimated Calcium Intake From Dairy Products Milk 8 oz 00 mg Yogurt 8 oz 00 mg Cheese oz 00 mg The BMD (gr/cm ) of the lumbar spine and femoral neck was measured with dual energy X-ray absorptiometry (Hologic QDR 00A Fan Beam X-ray Bone Densitometer, Hologic, Bedford, MA). During measurement of the lumbar spine, the child was supine and physiological lumbar lordosis was flattened by elevation of the knees. For femoral neck positioning, the manufacturer s standards were used. All measurements were performed and analyzed by the same person. This measurement was an areal density that varied with bone size. Bone volume was calculated based on the -dimensional DXA measurements on L L and the femoral neck. To calculate vbmd of the lumbar spine and femoral neck, the mathematical model of Kroger et al (9) was used, which assumed the lumbar body and femoral neck as having a cylindrical shape (9). The volume of the femoral neck is P (radius of femoral neck) height of measured area in femoral neck P (area of the femoral neck from the scan projection r h) / height of measured area in femoral neck. So vbmd is: BMD (/[P height/area]). The height of the femur neck can be obtained on the scans. Each lumbar vertebral body was approximated as a cylinder. The diameter and height of the four vertebral bodies were obtained from DXA scans. The bone volume of each vertebral body is calculated as p (diameter/) height, where the diameter of the vertebral column is area/height of the four vertebrae, which can be obtained on the scans (9). The SPSS version 0.0 program (SPSS Inc., Chicago, IL, USA) was used for statistical analysis. The results are given as mean 6 SD. Two-way variance analyses were used for the statistical analysis of abmd and vbmd related to gender and age. The results of the two-way variance analyses showed a significant difference between age and gender, but the interaction between age and gender factors were not statistically significant, indicating that the changes between age groups were similar between males and females. For this reason the variables were analyzed separately according to age groups with one-way variance analysis. Multiple regression analysis was performed with the backward elimination method to find the factors (i.e., puberty, height, and weight) influencing abmd and vbmd. Results The abmd of the lumbar spine (L L) and femoral neck increased with age in boys and girls. Mean abmd of the lumbar spine and femoral neck in boys and girls in age groups are given in Table. s and females in the same age groups were compared with two sample Student s t-tests. Mean values of the lumbar abmd were similar in males and females until the age of 0 years, and a significant difference between the two groups at the age of 0 years and at the ages of through years were found ( p! 0.0). In contrast, the femoral neck abmd of the boys was greater than the girls, but was only statistically significant at ages 8 and 6 years ( p! 0.0). The Lumbar vbmd was similar in both groups until the age of 8 years ( p O 0.0). The increment was statistically
3 86 Goksen et al. Table Increase of abmd and vbmd L L According to Age in s and s s s abmd vbmd abmd vbmd Age n Mean 6 SD Mean 6 SD n Mean 6 SD Mean 6 SD Abbr: abmd, areal bone mineral density; vbmd, volumetric bone mineral density; SD, standard deviation. significant between the ages of and years and through 8 years in girls, and through 8 years in boys ( p! 0.0). Femoral vbmd was only significantly different at the ages of 8 and 6 years ( p! 0.0) between girls and boys and did not increase with age (r 0.0 and 0.6 in girls and boys, respectively). Mean vbmd of the lumbar spine and femoral neck in boys and girls are given in Table. Because the variations according to age for males and females were not similar for lumbar abmd, different regression models were performed for boys (i.e., predicted BMD, L L 0. 8 age, R % 8,6; p ) and girls (i.e., predicted BMD, L L 0.7 [0.06 age] [0.0 age ] [ age, R % 76,6; p ]). Because the interaction was not significant between gender and age in areal femur neck BMD, one regression model was performed for both males and females (i.e., predicted femur neck age, R % 67, ; p ). Figures show abmd and vbmd of lumbar vertebrae and the femoral neck according to pubertal development. In both sexes, increase in abmd L L values according to pubertal status were significant except abmd did not differ between Tanner stage and stage ( p O 0.0). There was no difference in L L abmd between males and females according to pubertal status. A significant difference was found between stages and, and and in femoral neck abmd ( p! 0.0). Lumbar and femoral vbmd did not change with pubertal status as indicated by Tanner in either the males or the females. Lumbar and femoral abmd and lumbar vbmd showed positive correlation with age, height, weight, and physical activity in both females and males. Femoral neck vbmd showed no correlation with age, height, and weight in females and showed a negative correlation with age, height, and weight in males. Correlation coefficients decreased in spine vbmd, and the significance disappeared in femoral neck vbmd (Table ). As age and growth variables are codependent for abmd, the relationship among these was examined using multiple regression tests with the backward elimination method. With multiple regression analysis, we revealed that approximately 8% of the observed changes in lumbar abmd were accounted for by puberty, age, and weight in girls (i.e., predicted L L abmd puberty 0 age () 0.9 weight[log]). As much as 8% of variation was explained by age, weight, and height in boys (i.e., predicted L L abmd age age () 0.77 age[log].87 height[log] 0.90 weight[log]). Forty percent of the changes in lumbar vbmd were accounted for by age and weight in girls (i.e., predicted L L vbmd 0.07 age weight 006 age () 0.7 weight[log]), and by 8% 0% by age, weight, and height in males (i.e., predicted L L vbmd.90.0 age weight 0. age[log]. height[log] 0. weight[log]). Median calcium (Ca) intake of the children according to age groups.99, 7.99, and 8 8 years were 97 (range, 0,0), 80 (range, 0,60), 80 (range, 0,80) mg/d, respectively.
4 BMD in Pediatrics 87 Table Increase of Areal and Volumetric Femoral Neck BMD According to Age in s and s s s abmd vbmd abmd vbmd Age n Mean 6 SD Mean 6 SDS n Mean 6 SD Mean 6 SDS Abbr: BMD, bone mineral density; abmd, areal bone mineral density; vbmd, volumetric bone mineral density; SD, standard deviation; SDS, Standard deviation score. There was a significant difference between boys and girls regarding duration of physical activity ( vs. 6.7 min/wk, respectively; p! 0.0). There were no correlations between femoral vbmd and physical activity Mean abmd L L Error bars: 9.00% CI Fig.. Areal BMD of lumbar vertebrea according to pubertal development (p! 0.0). in either boys or girls, and no correlations between any of the outcome measures and Ca intake. Discussion The DXA of the lumbar vertebrae and femoral neck is useful in the measurement of BMD in children because of its accuracy, low radiation dose, short scan time, and ease of examination without sedation. Age, weight, height, pubertal status, nutrition, physical activity, genetics, and ethnicity are the factors that influence peak bone mass and BMD (,). In this study, lumbar BMD started to increase at the age of but showed a steeper increase from the age of 0 years in girls and years in boys. Lumbar abmd showed a significant difference between girls and boys at ages 0 through years. This suggests the rapid development of spinal bone mass in girls indicating earlier onset of puberty in girls than in boys. Kroger et al (9) showed the same increase after the age of 0 years in girls and years in boys. Rubin et al () showed that the increase started at the age of 0 years until the age of years in girls and from the age of to 7 years in boys. The increase in femoral neck abmd in girls and boys was linear as in the study of Kroger et al (9). This could be due to the increased cortical bone in the femoral neck. The Femoral neck abmd showed linear increase in both genders until the age of. After this age, similar to the studies of Faulkner et al () and Bonjour et al (7), the increase in males was dominant but not significant. A significant difference was found at the age of 8 and 6 years between boys and girls, respectively.
5 88 Goksen et al Mean vbmd L L Mean vbmd Femur neck Error bars: 9.00% CI Error bars: 9.00% CI Fig.. Volumetric BMD of lumbar vertebrea according to pubertal development. Fig.. Volumetric BMD of femur neck according to pubertal development. Faulkner et al () found males to have a greater abmd at the femoral neck at all ages. Lumbar vbmd increased with age, and there was no significant difference between girls and boys. It has been shown that volumetric BMD reduced the effects of age on BMD, but it is still dependent on age. Kroger et al (9), Boot et al () and Lu et al () showed that lumbar vbmd was only slightly Mean abmd Femur neck Error bars: 9.00% CI Fig.. Areal BMD of femur neck according to pubertal development (p! 0.0). influenced by age, indicating a slow increase in bone density. Kroger et al (9), when using vbmd, found the difference was statistically significant between ages 6 through 8 years. Femoral neck vbmd was independent of age during childhood and adolescence. Similar results have been shown with quantitative computerized tomography (QCT) and DXA (,, 7). Although in our study, abmd values were different between girls and boys according to age depending on earlier puberty in girls, there was no difference in Tanner stages between males and females, because each stage represents the same maturity. Spinal abmd was significantly different in every Tanner stage in girls and boys, except Tanner stages and. Lumbar vbmd did not change with pubertal status. Femoral neck abmd was different between Tanner stages and, and and. There was no difference between Tanner stages in femoral neck vbmd. Boot et al () and Rio et al (6) revealed a positive association between Tanner stage and abmd and vbmd of the lumbar spine. Although Southard et al (6) showed an increase in every pubertal stage, Boot et al (), after adjusting for age, showed that spinal abmd did not increase with puberty in boys but showed that puberty was a major determinant for abmd. Both lumbar abmd and vbmd increased with age, but in spinal vbmd the regression line decreased and there was no correlation of age with vbmd of the femur neck in girls and a negative correlation in boys suggesting that BMD increases were due to increases of bone size. Although corrections with mathematical formulas are not ideal or anatomically perfect, they are simple and practical in clinical practice (9). The normalization of BMD values considering the size of bones is necessary if the child is to be followed-up through the growing years. In children with small bones, areal density can lead
6 BMD in Pediatrics 89 Table Correlation Analyses Between Age, Weight, Height, Calcium Intake, Physical Activity, and Areal and Volumetric BMD in the Lumbar Area and Femoral Neck Height Weight Age Calcium intake Physical activity s abmd L- r p vbmd L r p abmd femoral neck r p vbmd femoral neck r p s abmd L r p vbmd L r p abmd femoral neck r p vbmd femoral neck r p Abbr: BMD, bone mineral density; BMD, areal bone mineral density; vbmd, volumetric bone mineral density. to inaccurate assumptions. We can state that the use of abmd in growth-retarded children will have some restrictions in determining Z-scores. Correct interpretation of DXA is important for identifying growth-retarded children who may be at a real risk of osteoporosis as in renal insufficiency and other chronic diseases causing growth retardation. If a child develops normal puberty, but is short, vbmd can be used, but if the child has delayed puberty and is short than abmd according to height groups can be used (8). Both Bonjour et al (7) and Takahashi () showed an abrupt increase in BMD from 0 cm to adult height in men and in women from 0 cm, which suggested the importance of pubertal growth spurt on bone mineral accumulation. With multiple regression analyses Rubin et al () revealed that weight and puberty were the most effective parameters on spinal BMD (r ). In the same study 76% of the observed changes in radial (cortical) BMD were accounted for by the independent variables of weight, height, puberty, and age, with weight being the single strongest predictor. In our study with multiple regression analysis, spinal abmd was accounted for by puberty, age, and weight in girls, and age, weight, and height in boys. Femoral abmd was accounted for by age and weight in girls, and by weight and height in boys. Femoral neck vbmd was influenced by weight in boys but not in girls. This can be due to greater physical activity in boys possibly creating more muscle mass in boys than girls. With more muscle, the forces on the bones may be greater. Both genders, when adjusted for age, femoral neck abmd and spinal abmd was fluenced by weight and vbmd was not influenced by weight. Weight influence was probably due to the weight bearing on bones. Lonzer et al (7) determined positive correlation between weight and BMD. It is known that calcium intake during childhood is important for optimal mineralization of the skeleton. There was no correlation between calcium intake and spinal and femoral abmd and vbmd. The relatively higher Ca intake in younger children and lower intake in adolescence may account for these results because the correlation vanished when age was held constant as in Kroger et al s (9) study. However, Ca intake was estimated from a questionnaire and not from a -day record. We believe that our data are not precluded by an effect of Ca intake on bone mass in children. Slemenda et al (9) found that the total hours of weight bearing activity per week was positively correlated to BMD of the radius and hip in boys and girls ages to years. Other studies found a positive correlation between physical activity and lumbar spine BMD or femoral neck in children (9,). Boot et al (), found positive correlation with BMD in boys only. In our study, physical activity had a positive association with femoral and lumbar abmd and vbmd, suggesting that physical activity may be an important determinant of bone density. The effect of physical activity on vbmd may suggest that it increases not only bone size but also vbmd. This cross-sectional study provides normative values for lumbar spine and femoral neck abmd and vbmd of children and adolescents as young as years of age for the Turkish population. The major determinant of BMD seems to be weight in girls and boys. References. Haeney RP, Abrams S, Hughes DB, et al. 000 Peak bone mass. Osteoporos Int :
7 90 Goksen et al.. Eastell R, Lambert H. 00 Diet and healthy bones. Calcif Tissue Int 70(): Takahashi Y, Minamitani K, Kobayashi Y, Minagawa M, Yasuda T, Niimi H. 996 Spinal and femoral bone mass accumulation during normal adolescence:comparision with female patients with sexual precocity and with hypogonodism. J Clin Endocrinol Metab 8:8.. Lu PW, Cowell CT, Lloyd-Jones SA, Briody JN, Howman Giles R. 996 Volumetric bone mineral density in normal subjects, aged -7 years. J Clin Endocrinol Metab 8: Boroncelli GI, Saggase G. 000 Critical age and stages of puberty in the accumulation of spinal and femoral bone mass: The validity of bone mass measurements. Horm Res (Suppl ): Schönau E. 998 Problems of bone analyses in childhood and adolescence. Pediatr Nehprol : Compston JE. 99 Bone Density: BMC, BMD, or corrected BMD? Bone 6(): Warner JT, Cowan FJ, Dunstan FDJ, Evans WD, Webb DKH, Gregory JW. 998 Measured and predicted bone mineral content in healthy boys and girls aged 6-8 years: adjustment for body size and puberty. Acta Pediatr 87: Kroger H, Kotaniemi A, Vainio P, Alhava E. 99 Bone densitometry of the spine and femur in children by dual energy x ray absorptiometry. Bone and Mineral 7: Gilsanz V. 998 Bone density in children: review of the available techniques and indications. European J of Radiology 6: Faulkner RA, Bailey DA, Drinkwater DT, McKay HA, Arnold C, Wilkonson AA. 996 Bone Densitometry in Canadian children 8-7 years of age. Calcif Tissue Int 9:.. Sabatier JP, Souquieres G, Benmalk A, Marcelli C. 999 Evoluation of lumbar bone mineral content during adolescence and adulthood: a longitudinal study in 9 healthy females 0- years of age and 06 premenopausal women. Osteoporosis Int 9: Lu PW, Briody JN, Ogle GD, et al. 99 Bone Mineral Density of total body spine and femoral neck in children and young adults: a cross sectional and longitudinal study. J Bone Mier Res 9: 8.. Glastre C, Braillon P, David L, Cochat P, Meunier PJ, Delmas PD. 990 Measurement of bone mineral content of lumbar spine by dual energy x-ray absorptiometry in normal children: correlations with growth parameters. J Clin Endocrinol Metab 70:0.. Bachrach L. 00 Acquisition of optimal bone mass in childhood and adolescence. Trends Endocrinol and Metab (): Southard RN, Morris JD, Mahan JD, Hayes JR, Torch MA, Sommer A, Zipf W. 99 Bone mass in healthy children: measurement with quantitative DEXA. Radiology 79: Bonjour JP, Theintz G, Buchs B, Slosman D, Rizzoli R. 99 Critical years and stages of puberty for spinal and bone mass accumulation during adolescence. J Clin Endocrinol Metab 7: Arabi A, Nabulsi M, Maalouf J, Choucair M, Khalife H, Vieth R, El-Hajj Fuleihan G. 00 Bone mineral density by age, gender, pubertal stages, and socioeconomic status in healthy Lebanese children and adolescents. Bone (): del Rio L, Carrascosa A, Pons F, Gusinye M, Yeste D, Domenech FM. 99 Bone mineral density of the lumbar spine in white Mediterranean Spanish children and adolescents: changes related to age, sex, and puberty. Pediatr Res (): Neyzi O, Yalçındağ A, Alp H. 97 Heights and weights of Turkish children. J Trop Pediatr Environ Child Health 9():.. Physician s guide to prevention and treatment of osteoporosis. Developed by the National Osteoporosis Foundation, Tanner JM. 97 Recording adolescent physical changes: Tanner system. Del Med J (): Greulich WW, Pyle SI. 98 Radiographic atlas of skeletal devolepment of the hand and wrist, nd ed. Stanford: Stanford University Press.. Rubin K, Schirduan V, Gendrau P, Sarfarazi M, Mendeola R, Dalsky G. 99 Predictors of axial and peripheral bone mineral density in healthy children and adolescents, with special attention to the role of puberty. J Pediatr : Boot AM, Ridder MA, Pols HA, Krenning PE, Keizer Schrama SM. 997 Bone mineral density in children and adolescence: relation to puberty, calcium intake and physical activity. J Clin Endocrinol Metab 8: Rio L, Carrascosa A, Pons F, Gusinye M, Yeste D, Domenech M. 99 Bone mineral density of the lumbar spine in white mediterranean Spanish children and adolescence: changes related to age, sex and puberty. Pediatr Res : Lonzer MD, Imrie R, Rogers D, Worley D, Licata A, Secic M. 00 Effects of heredity, age, weight, puberty, activity and calcium intake on bone mineral density in children. Clinical Pediatrics (): Goksen D, Darcan S, Kara P, Mir S, Çoker M, Kabasakal C. 00 Bone mineral density in pediatric and adolescent renal transplant patients. How to evaluate? Pediatr Transplant 9(): Slemenda CW, Miller JZ, Hui SL, Reister TK, Johnston CC. 99 Role of physical activity in the development of skeletal mass in children. J Bone Miner Res 6:7.
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