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Table 2 Effect of the intervention on knowledge and decisional conflicta

From: Effectiveness of a decision aid for promoting colorectal cancer screening in Spain: a randomized trial

  Center A Center B DA effect Center effect Interaction
DA
(n = 43)
Control (n = 40) DA
(n = 10)
Control (n = 14)
Knowledge 75 (14.4) 59.4 (14.4) 87.5 (11.3) 60.1 (17.4) 39.6 (< 0.001) 3.83 (0.055) 2.96 (0.088)
DCS 22.2 (14.6) 48.9 (21.3) 29.7 (11.8) 29.2 (12.2) 10.8 (0.001) 2.31 (0.131) 11.5 (0.001)
Informed 23.1 (17.5) 85.0 (20.6) 33.3 (20.8) 33.9 (17.1) 49.3 (< 0.001) 21.0 (< 0.001) 47.5 (< 0.001)
Values 19.0 (14.7) 45.2 (39.0) 31.7 (11.0) 30.4 (14.8) 4.02 (0.048) 0.03 (0.861) 4.90 (0.029)
Support 21.3 (17.4) 29.2 (18.5) 25.8 (9.17) 29.8 (13.4) 2.24 (0.138) 0.42 (0.518) 0.25 (0.620)
Uncertainty 25.4 (18.9) 50.2 (34.7) 32.5 (19.8) 27.4 (22.3) 2.53 (0.115) 1.61 (0.208) 5.84 (0.017)
Effectiveness 22.2 (17.1) 38.3 (29.8) 26.3 (7.68) 25.9 (14.9) 2.29 (0.133) 0.65 (0.421) 2.51 (0.116)
  1. aMeans (sd) by group and center, and results of ANOVAs (F, p-value). For knowledge (range 0–100), higher scores indicate a better result, and the opposite applies for the decisional conflict scale (DCS) and its subscales (range 0–100). DA decision aid