Use of Propensity Scores to Assess Comparability of Treatment Groups in a Registry Program
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1 Use of Propensity Scores to Assess Comparability of Treatment Groups in a Registry Program Kenneth J Rothman On behalf of Menno V Huisman, Gregory Y.H. Lip, Hans-Christoph Diener, Sergio J Dubner, Chang-Sheng Ma, Kristina Zint, Christine Teutsch, Nils Schoof, Miney Paquette, Eva Kleine, Dorothee B Bartels, Jonathan Halperin and the GLORIA AF study team 1
2 Disclosure Information Kenneth J Rothman is an employee of RTI Health Solutions, an independent non-profit research organization that does work for government agencies and pharmaceutical companies. GLORIA-AF is sponsored by Boehringer Ingelheim 2
3 GLORIA-AF GLORIA-AF is a large, international, observational registry program of patients with newly diagnosed AF at risk of stroke Study objectives: 1. Characterize patients in various regions of the world newly diagnosed with nonvalvular AF at risk for stroke 2. Describe current patterns of antithrombotic treatment 3. Assess effectiveness and safety of antithrombotic treatments 3
4 Design of GLORIA-AF Baseline Visit Baseline Visit Baseline Visit 3M 6M 1YR 2YR 6M 1YR 2YR 3YR Phase I Cross-sectional Status: Ended Jan 2013 Patients on dabigatran etexilate Phase II Cross-sectional, longitudinal followup of dabigatran patients Status: Currently ongoing All patients Phase III Cross-sectional, longitudinal follow-up of all patients Status: Start after comparability assessment of treatment groups in Phase II 4
5 Methods in GLORIA-AF In Phase II and III Propensity Score (PS) techniques will be used to assess comparability of the treatment groups (dabigatran compared with VKA). Specifically, we measure the proportion of patients within the range of overlapping PS. Figure: Sebastian Schneeweiss, Jerry Avorn A review of uses of health care utilization databases for epidemiologic research on therapeutics Journal of Clinical Epidemiology Volume 58, Issue
6 Methods in GLORIA-AF The decision to begin Phase III will be primarily based on the degree of overlap of the PS. If 95% or more of patients are in the region of overlapping PS, we will proceed to Phase III for that region. Assessment of comparability is made independently in geographic regions. The first assessment occurred in North America. 6
7 Results From November, 2011 through April, 2013, 1672 eligible patients were enrolled in North America. DE was initiated in 536 and VKA in 488 patients. 15% of patients were prescribed other Novel Oral Anticoagulants (NOACs), and aspirin in 11%. 11% of patients did not receive antithrombotic therapy to prevent ischemic stroke.
8 Results DE (N = 536) VKA (N = 488) n (%) n (%) Age class < 65 years 132 (24.6) 107 (21.9) 65 to < 75 years 204 (38.1) 144 (29.5) 75 years 200 (37.3) 237 (48.6) Gender Male 316 (59.0) 262 (53.7) Female 220 (41.0) 226 (46.3) Hypertension Yes, uncontrolled 43 (8.0) 48 (9.8) Yes, controlled 381 (71.1) 355 (72.7) No 112 (20.9) 85 (17.4) Missing/unknown data were imputed using Naïve Bayes classifier. DE, dabigatran etexilate; VKA, vitamin K antagonist.
9 Results DE (N = 536) VKA (N = 488) n (%) n (%) Diabetes mellitus No 411 (76.7) 328 (67.2) Yes 125 (23.3) 160 (32.8) CHADS 2 Score Low (score=0) 39 (7.3) 23 (4.7) Moderate (score=1) 206 (38.4) 133 (27.3) High (score>=2) 291 (54.3) 332 (68.0) Missing/unknown data were imputed using Naïve Bayes classifier. DE, dabigatran etexilate; VKA, vitamin K antagonist.
10 Results Propensity score distribution by treatment group 10
11 Results The proportion of patients in the overlapping region of the PS between the two treatment groups was 99% when the model contained a pre-specified subset of risk factors for stroke and bleeding. In a sensitivity analysis that included all collected baseline characteristics, the overlapping region comprised 96%. Either result was sufficient to proceed to the comparative Phase III.
12 Conclusions Nearly all patients fell within the overlapping range of propensity scores. Mostly overlapping PS ranges does not guarantee an absence of confounding. It does, however, allow for control of confounding in the data analysis for those factors that are included in the PS model.
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