Table 5.

Regression analyses of laureate characteristics and H index values from Google Scholar, Web of Science and Scopus

Characteristic	Univariate analysisa	p value	Multivariate analysisa, b	p value
Birth year
Google Scholar	0.616 (0.500–0.731)	<0.0001	0.561 (0.449–0.672)	<0.0001
Web of Science	0.273 (0.209–0.336)	<0.0001	0.280 (0.218–0.343)	<0.0001
Scopus	0.643 (0.542–0.744)	<0.0001	0.594 (0.497–0.690)	<0.0001
Country of affiliation at time of award
Google Scholar	−0.006 (−0.009–0.003)	<0.0001	−0.004 (−0.007–0.000)	0.067
Web of Science	−0.001 (−0.004–0.001)	0.352	−0.002 (−0.06–0.001)	0.159
Scopus	−0.003 (−0.007–0.000)	0.053	−0.002 (−0.007–0.003)	0.467
Physician status
Google Scholar	−0.002 (−0.004–0.001)	0.223	0.003 (0.000–0.007)	0.025
Web of Science	0.001 (–0.001–0.003)	0.521	0.003 (0.000–0.006)	0.029
Scopus	−0.003 (−0.006–0.00l)	0.018	0.003 (0.000–0.007)	0.079

^aValues are expressed as unstandardized B coefficients (95% confidence intervals).

^bVariables included birth year, country of affiliation at time of award and physician status.