Table 7. Linear regression: total usefulness value.

Predictor	Estimate	SE	Statistic	P value	95% CI
(Intercept)	8.26	0.83	9.90	<0.01	(6.61 to 9.91)
Sample	<0.01	<0.01	0.19	0.85	(−0.01 to 0.01)
Continent of trial conduct
Europe	0.11	0.55	0.20	0.84	(−0.99 to 1.21)
North America	1.09	0.65	1.68	0.10	(−0.20 to 2.37)
Journal type
General medicine	−0.28	0.74	−0.38	0.70	(−1.74 to 1.18)
Orthopedics	−0.40	0.56	−0.72	0.47	(−1.51 to 0.70)
Funding source
Hospital	3.23	0.65	4.98	<0.01	(1.94 to 4.52)
Self-funded/no outside funding	4.11	0.59	6.99	<0.01	(2.94 to 5.27)
Impact factor of the journal	0.51	0.14	3.64	<0.01	(0.23 to 0.78)