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

Akbari-Chehrehbargh, Zahra; Tavafian, Sedigheh Sadat; Montazeri, Ali

doi:10.1186/s12889-020-08566-z

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
Variable (score range)	(I) Time	(J) Time	Mean Difference (I – J)	P-value	Lower Bound	Upper Bound
Behavior (6–30)	Baseline	Immediate	−3.999^a	< 0.001	− 5.260	− 2.737
		3-months follow-up	−4.710^a	< 0.001	− 5.972	− 3.448
		6-months follow-up	−4.683^a	< 0.001	−5.948	−3.418
	Immediate	3-months follow-up	−0.711	0.61	−1.973	0.550
	Immediate	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	−1.577^a	< 0.001	−2.041	−1.113
		3-months follow-up	−1.760^a	< 0.001	− 2.224	− 1.296
		6-months follow-up	−1.849^a	< 0.001	−2.314	−1.384
	Immediate	3-months follow-up	−0.183	0.29	−0.647	0.281
	Immediate	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	−12.658^a	< 0.001	−15.538	−9.778
		3-months follow-up	−11.860^a	< 0.001	−14.740	−8.980
		6-months follow-up	−11.779^a	< 0.001	− 14.666	−8.891
	Immediate	3-months follow-up	0.798	0.86	−2.082	3.678
	Immediate	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	−2.036^a	< 0.001	−2.777	−1.294
		3-months follow-up	−1.320^a	0.001	−2.062	−0.578
		6-months follow-up	−1.641^a	< 0.001	−2.385	− 0.897
	Immediate	3-months follow-up	0.716	0.15	−0.026	1.457
	Immediate	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	−3.629^a	< 0.001	−4.918	−2.340
		3-months follow-up	−3.570^a	< 0.001	−4.859	−2.281
		6-months follow-up	−4.135^a	< 0.001	−5.427	−2.843
	Immediate	3-months follow-up	0.059	0.95	−1.230	1.348
	Immediate	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

^aTukey’s HSD Post hoc test. The mean difference is significant at the 0.05 level

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