Table 3.

Correlations among variables (N=10,560).

Variable		Medical title	Academic title	Hospital level	Ln(Articles+1)	Ln(Thank-you letters+1)	Recommended value	Usage time	Conversion rate
Medical title
	β	1	.583	.008	.029	.099	.138	.185	–.014
	P value	—a	<.001	.40	.003	<.001	<.001	<.001	.15
Academic title
	β	.583	1	.015	.137	.254	.307	.392	.065
	P value	<.001	—	.14	<.001	<.001	<.001	<.001	<.001
Hospital level
	β	.008	.015	1	–.047	.064	.084	.056	–.045
	P value	.40	.14	—	<.001	<.001	<.001	<.001	<.001
ln(Articles+1)
	β	.029	.137	–.047	1	.391	.281	.252	.410
	P value	.003	<.001	<.001	—	<.001	<.001	<.001	<.001
ln(Thank-you letters+1)
	β	.099	.254	.064	.391	1	.758	.365	.581
	P value	<.001	<.001	<.001	<.001	—	<.001	<.001	<.001
Recommended value
	β	.138	.307	.084	.281	.758	1	.292	.431
	P value	<.001	<.001	<.001	<.001	<.001	—	<.001	<.001
Usage time
	β	0.185	.392	.056	.252	.365	.292	1	.009
	P value	<.001	<.001	<.001	<.001	<.001	<.001	—	.34
Conversion rate
	β	–.014	.065	–.045	0.410	.581	.431	.009	1
	P value	.15	<.001	<.001	<.001	<.001	<.001	.34	—

^aNot applicable.