. 2019 Dec 6;8:e52646. doi: 10.7554/eLife.52646

Table 2. Meta-regression across journals of log fold-changes for having a preprint.

A positive coefficient means the log fold-change for having a preprint increases as that variable increases (or if articles in that journal are immediately open access). However, coefficients for different variables have different units and are not directly comparable. P-values were adjusted using the Bonferroni-Holm procedure, based on having fit two models. Depending on the two p-values for a given variable, the procedure may have left one p-value unchanged. Regression statistics for the intercept are shown in Supplementary file 12.

Metric	Journal-level variable	Coef.	Std. error	95% CI (lower)	95% CI (upper)	t-statistic	p-value	Adj. p-value
Attention Score	Immediately open access	0.118	0.076	−0.037	0.273	1.551	0.130	0.260
	log₂(Impact Factor)	−0.025	0.040	−0.107	0.057	−0.616	0.542	0.542
	log₂(% of articles with preprints)	−0.064	0.032	−0.129	0.001	−1.991	0.054	0.109
Citations	Immediately open access	−0.013	0.069	−0.152	0.126	−0.187	0.853	0.853
	log₂(Impact Factor)	0.044	0.036	−0.030	0.117	1.211	0.234	0.468
	log₂(% of articles with preprints)	0.037	0.029	−0.022	0.095	1.283	0.208	0.208