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Table 1 Participant flow by group

From: Looking inside the black box: results of a theory-based process evaluation exploring the results of a randomized controlled trial of printed educational messages to increase primary care physicians’ diabetic retinopathy referrals [Trial registration number ISRCTN72772651]

Retinopathy screening (N=437)
   Insert No insert
Outsert Patient Reminder Note n=252 Baseline questionnaires sent n=144 Baseline non-response n=252 Baseline questionnaires sent n=136 Baseline non-response
n=36 Follow-up attrition n=34 Follow-up attrition
n=5 Excluded n=6 Excluded
n=67 Analysed n=76 Analysed
No Patient Reminder Note n=252 Baseline questionnaires sent n=150 Baseline non-response n=252 Baseline questionnaires sent n=146 Baseline non-response
n=20 Follow-up attrition n=29 Follow-up attrition
n=6 Excluded n=4 Excluded
n=76 Analysed n=73 Analysed
No Outsert No Patient Reminder Note n=252 Baseline questionnaires sent n=141 Baseline non-response n=252 Baseline questionnaires sent n=146 Baseline non-response
n=33 Follow-up attrition n=24 Follow-up attrition
n=5 Excluded n=10 Excluded
n=73 Analysed n=72 Analysed