BMC Musculoskeletal Disorders

Table 3 Meta-regression: the effect of impact factor, COI, Funding category, year, and sample size and on absolute values of effect size

From: The effect of journal impact factor, reporting conflicts, and reporting funding sources, on standardized effect sizes in back pain trials: a systematic review and meta-regression

		Unadjusted			Adjusted ^b
		β	P	95 % CI for β	β	P	95 % CI for β
Impact factor
		−0.01	0.54	−0.04 to 0.02	0.004	0.81	−0.03 to 0.04
COI	Category ^a
	Reported none	0.13	0.52	−0.25 to 0.51	-0.14	0.51	−0.55 to 0.28
	Reported some	−0.24	0.42	−0.82 to 0.34	-0.21	0.46	−0.78 to 0.36
Funding	Category ^a
	Reported none	0.94	0.001	0.42 to 1.45	1.02	0.001	0.44 to 1.59
	Reported some	0.05	0.76	−0.27 to 0.37	0.12	0.51	−0.24 to 0.48
Publication year
		−0.05	0.31	−0.14 to 0.05	−0.05	0.31	−0.14 to 0.05
Sample size
		−0.0004	0.20	−0.001 to 0.0002	−0.0004	0.20	−0.001 to 0.0003

^acomparison: none reported
^bfor other variables in the model

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