Table 4.

Regression results.

Variables	Model 1	Model 2	Model 3
open_time	0.0112***	0.00232***	0.00236***
	(4.06)	(4.88)	(4.81)
hospital	0.0294**	0.0117	0.0125
	(2.15)	(0.27)	(0.29)
last_online	—	0.00135	0.00119
		(1.01)	(0.90)
service	—	0.0295***	0.0279***
		(5.86)	(5.59)
title	—	−0.0253***	−0.0225**
		(−2.62)	(−2.35)
ln (article+1)	—	0.0842***	0.0863***
		(8.64)	(8.90)
avatar	—	0.0860***	0.0844***
		(6.68)	(6.62)
introduction	—	−0.00956***	−0.00819**
		(−2.68)	(−2.31)
professional	—	0.00443	0.00529
		(0.54)	(0.65)
ln (report+1)	—	0.178***	0.172***
		(24.95)	(24.22)
ln (vote+1)	—	0.288***	0.137***
		(13.75)	(4.47)
ln (letter+1)	—	0.304***	0.0260
		(11.72)	(0.53)
ln (gift+1)	—	0.249***	0.159***
		(24.49)	(10.81)
heat	—	0.0977***	0.125***
		(7.76)	(7.67)
risk × ln (vote+1)	—	—	0.235***
			(5.86)
risk × ln (letter+1)	—	—	0.376***
			(6.31)
risk × ln (gift+1)	—	—	0.155***
			(7.78)
risk × heat	—	—	0.0764***
			(2.93)
Constant	4.638***	3.251***	3.208***
	(17.78)	(41.48)	(39.00)
N	10,446	10,446	10,446
R 2	0.030	0.384	0.395
F	17.80***	388.31***	316.10***

t-values in parentheses;

^***p < 0.01,

^**p < 0.05.