Effectiveness of physiotherapy interventions for back care and the prevention of non-specific low back pain in children and adolescents: a systematic review and meta-analysis

Table 4 Results of the simple meta-regressions for the trunk flexion endurance measures in the posttest, taking continuous moderator variables as predictors

Predictor variable	k	b _j	CI.LL	CI.UL	F	p
Number of weeks of treatment	7	0.054	-0.055	0.163	1.612	0.260
Time of treatment per week (intensity)	7	0.869	0.225	1.513	12.026	0.018
Total time of treatment (magnitude)	7	0.031	0.004	0.057	8.958	0.030
Total posttest sample size	7	-0.006	-0.024	0.011	0.897	0.387

k number of studies, b_jregression coefficient of each predictor, CI.LL confidence interval of lower limit, CI.UL confidence interval of upper limit, FKnapp-Hartung’s statistic for testing the significance of the predictor (the degrees of freedom for this statistic are 1 for the numerator and k – 2 for the denominator), p probability level for the F statistic

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