Table 3 Pairwise comparisons of mean percentage of consents per school by intervention group (Bonferroni criterion)
Interventions | Mean difference | Standard error | p-value | 95% confidence interval | |
|---|---|---|---|---|---|
FISA&DM | FIS | −6.80 | 3.60 | 0.59 | −16.93 to 3.34 |
|  | Promotion of the survey | −11.11* | 3.57 | 0.02 | −21.21 to −1.01 |
|  | Multiple letters | −16.65* | 3.63 | <0.001 | −26.89 to −6.40 |
|  | Control | −10.02 | 3.60 | 0.06 | −20.19 to 0.15 |
FIS | Promotion of the survey | −4.32 | 3.47 | 1.00 | −14.13 to 5.50 |
|  | Multiple letters | −9.65 | 3.53 | 0.06 | −19.82 to 0.12 |
|  | Control | −3.22 | 3.50 | 1.00 | −13.11 to 6.67 |
Promotion of the survey | Multiple letters | −5.53 | 3.51 | 1.00 | −15.46 to 4.40 |
|  | Control | 1.10 | 3.50 | 1.00 | −8.76 to 10.95 |
Multiple letters | Control | 6.63 | 3.54 | 0.62 | −3.38 to 16.63 |