BMC Musculoskeletal Disorders

Table 2 Meta-regression: the effect of impact factor, COI, Funding category, year, and sample size on 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	0.81	−0.04 to 0.05	0.02	0.53	−0.03 to 0.06
COI	Category ^a
	Reported none	−0.08	0.73	−0.55 to 0.39	−0.14	0.62	−0.68 to 0.41
	Reported some	0.03	0.94	−0.70 to 0.76	0.02	0.95	−0.75 to 0.80
Funding	Category ^a
	Reported none	0.19	0.59	−0.49 to 0.86	0.27	0.48	−0.48 to 1.02
	Reported some	0.03	0.89	−0.39 to 0.45	0.05	0.85	−0.43 to 0.52
Publication year
		−0.05	0.42	−0.16 to 0.07	−0.05	0.44	−0.17 to 0.08
Sample size
		−0.0003	0.45	−0.001 to 0.0005	−0.0005	0.31	−0.002 to 0.0005

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

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ISSN: 1471-2474

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