Abstract:
OBJECTIVE:While there is growing evidence on the effectiveness of structured care for diabetic patients in trial settings, standard population level evaluations may misestimate intervention benefits due to patient selection. In order to account for potential biases in measuring intervention benefits, we tested the impact of calibration on margins as a novel adjustment method in an evaluation context compared with simple poststratification. RESEARCH DESIGN AND METHODS:We compared the results of a before-after evaluation on HbA1c levels after 1 year of enrollment in a French diabetes provider network (DPN) using an unadjusted sample and samples adjusted by simple poststratification to results obtained after adjustment via calibration on margins to the general diabetic population's characteristics using a national cross-sectional sample of diabetic patients. RESULTS:Both with and without adjustment, patients in the DPN had significantly lower HbA1c levels after 1 year of enrollment. However, the reductions in HbA1c levels among the adjusted samples were 22-183% lower than those measured in the unadjusted sample, regardless of the poststratification method and characteristics used. Compared with simple poststratification, estimations using calibration on margins exhibited higher performance. CONCLUSIONS:Evaluations of diabetes management interventions based on uncontrolled before-after experiments may overestimate the actual benefit for patients. This can be corrected by using poststratification approaches when data on the ultimate target population for the intervention are available. In order to more accurately estimate the effect an intervention would have if extended to the target population, calibration on margins seems to be preferable over simple poststratification in terms of performance and usability.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Chevreul K,Brunn M,Cadier B,Nolte E,Durand-Zaleski Idoi
10.2337/dc13-2141subject
Has Abstractpub_date
2014-07-01 00:00:00pages
1892-9issue
7eissn
0149-5992issn
1935-5548pii
dc13-2141journal_volume
37pub_type
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