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Table 4 Tukey multiple comparisons for all variables in intervention group

From: Effectiveness of a theory-based back care intervention on spine-related behavior among pupils: a school-based randomised controlled trial (T-Bak study)

Variable (score range) (I) Time (J) Time Mean Difference (I – J) P-value 95% Confidence Interval for Difference
Lower Bound Upper Bound
Behavior (6–30) Baseline Immediate −3.999a < 0.001 − 5.260 − 2.737
3-months follow-up −4.710a < 0.001 − 5.972 − 3.448
6-months follow-up −4.683a < 0.001 −5.948 −3.418
Immediate 3-months follow-up −0.711 0.61 −1.973 0.550
6-months follow-up −0.685 0.33 −1.950 0.580
3-months follow-up 6-months follow-up 0.027 0.94 −1.238 1.292
Knowledge (0–10) Baseline Immediate −1.577a < 0.001 −2.041 −1.113
3-months follow-up −1.760a < 0.001 − 2.224 − 1.296
6-months follow-up −1.849a < 0.001 −2.314 −1.384
Immediate 3-months follow-up −0.183 0.29 −0.647 0.281
6-months follow-up −0.272 0.41 −0.737 0.193
3-months follow-up 6-months follow-up −0.089 0.75 −0.554 0.376
Skills (0–46) Baseline Immediate −12.658a < 0.001 −15.538 −9.778
3-months follow-up −11.860a < 0.001 −14.740 −8.980
6-months follow-up −11.779a < 0.001 − 14.666 −8.891
Immediate 3-months follow-up 0.798 0.86 −2.082 3.678
6-months follow-up 0.879 0.70 −2.009 3.767
3-months follow-up 6-months follow-up 0.081 0.85 −2.806 2.969
Self-efficacy (4–16) Baseline Immediate −2.036a < 0.001 −2.777 −1.294
3-months follow-up −1.320a 0.001 −2.062 −0.578
6-months follow-up −1.641a < 0.001 −2.385 − 0.897
Immediate 3-months follow-up 0.716 0.15 −0.026 1.457
6-months follow-up 0.395 0.19 −.349 1.139
3-months follow-up 6-months follow-up −0.321 0.78 −1.065 0.423
Beliefs (6–30) Baseline Immediate −3.629a < 0.001 −4.918 −2.340
3-months follow-up −3.570a < 0.001 −4.859 −2.281
6-months follow-up −4.135a < 0.001 −5.427 −2.843
Immediate 3-months follow-up 0.059 0.95 −1.230 1.348
6-months follow-up −0.506 0.25 −1.799 0.786
3-months follow-up 6-months follow-up −0.565 0.74 −1.857 0.727
  1. aTukey’s HSD Post hoc test. The mean difference is significant at the 0.05 level