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Table 2 Pre- and post-intervention descriptive statistics of primary and secondary outcomes by intervention 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]

  Intention Attitude Subjective norm PBC
Mean ( SD) Mean ( SD) Mean ( SD) Mean ( SD)
Experimental factors N Pre-inter Post-inter Pre-inter Post-inter Pre-inter Post-inter Pre-inter Post-inter
No Insert No Outsert No patient reminder 72 6.32 (1.15) 6.24 (1.18) 6.15 (1.11) 6.15 (1.16) 6.14 (1.30) 6.23 (1.03) 6.14 (1.07) 6.06 (1.12)
Outsert No patient reminder 73 6.40 (0.95) 6.38 (1.00) 6.32 (0.81) 6.29 (0.84) 6.12 (1.07) 6.24 (0.88) 6.27 (0.97) 6.38 (0.73)
Patient reminder 76 6.21 (1.37) 6.33 (1.12) 6.30 (0.98) 6.10 (1.18) 6.02 (1.37) 6.17 (1.21) 6.05 (1.22) 6.14 (1.07)
Insert No Outsert No patient reminder 73 6.10 (1.43) 6.03 (1.48) 5.92 (1.25) 6.18 (1.05) 5.78 (1.55) 5.80 (1.59) 5.87 (1.24) 6.07 (1.05)
Outsert No patient reminder 76 6.31 (1.23) 6.20 (1.41) 6.15 (1.03) 6.11 (1.13) 6.11 (1.18) 6.04 (1.33) 5.92 (1.27) 5.92 (1.20)
Patient reminder 67 6.40 (1.06) 6.15 (1.53) 6.22 (0.99) 6.15 (1.16) 6.27 (1.01) 5.99 (1.40) 6.02 (1.17) 5.97 (1.29)
  1. Note. PBC, Perceived Behavioral Control; Pre-inter, Pre-intervention survey; Post-inter, Post-intervention survey.