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Table 3 Linear regression models for predicting change in the total knowledge score and the three domains

From: Evaluation of an educational intervention in oral health for primary care physicians: a cluster randomized controlled study

Explanatory variables Standardized regression coefficient Beta P-value of Wald test 95% confidence interval for Beta
Lower bound Upper bound
Model 1: total score
 Group A intervention 0.64 <  0.001 0.377 0.655
 Group B intervention 0.035 0.677 −1.14 1.75
 Age 0.06 0.525 − 0.06 0.11
 Gendera 0.09 0.311 − 0.77 2.39
 Working placeb 0.09 0.306 − 0.66 2.07
 Total score at baseline −0.30 <  0.001 − 0.63 − 0.20
Model 2: paediatric domain score
 Group A intervention 0.69 <  0.001 −1.62 2.74
 Group B intervention 0.03 0.723 −0.49 0.70
 Age 0.04 0.672 −0.03 0.04
 Gendera 0.06 0.539 − 0.46 0. 88
 Working placeb 0.11 0.235 −0.23 0.91
 Paediatric score at baseline −0.17 0.0350 −0.43 −0.08
Model 3: dental domain score
 Group A intervention 0.58 <  0.001 −1.02 1.92
 Group B intervention 0.19 0.235 −0.19 0.78
 Age 0.09 0.338 −0.02 0.04
 Gendera 0.02 0.809 − 0.45 0.58
 Working placeb 0.04 0.684 −0.36 0.54
 Dental score at baseline −0.44 <  0.001 −0.74 − 0.34
Model 4: medical domain score
 Group A intervention 0.42 <  0.001 −0.82 2.14
 Group B intervention −0.04 0.696 −0.81 0.54
 Age 0.04 0.657 −0.03 0.05
 Gendera 0.11 0.262 − 0.32 1.15
 Working placeb 0.09 0.343 −0.33 0.94
 Medical score at baseline −0.42 <  0.001 −0.67 − 0.29
  1. aGender:female = 1, male = 2, bWorking place: public = 1, public+private = 2