Table 5.

Regression results of subgroups.

Variables	High-risk (lung cancer)	Low-risk (pneumonia)
open_time	0.00389***	0.00114
	(7.37)	(1.36)
Hospital	0.0121	0.0110
	(0.22)	(0.18)
last_online	0.00134	0.000171
	(0.89)	(0.08)
service	0.0207***	0.0245**
	(4.16)	(2.70)
title	0.00674	−0.0376***
	(0.58)	(−2.60)
ln(article+1)	0.0423***	0.136***
	(4.13)	(8.14)
avatar	0.00513	0.0687***
	(0.38)	(3.11)
introduction	−0.00979***	−0.00651
	(−2.77)	(−1.01)
professional	0.00853	−0.0418**
	(1.08)	(−2.57)
ln (report+1)	0.118***	0.148***
	(18.55)	(8.29)
ln (vote+1)	0.381***	0.159***
	(17.50)	(4.20)
ln (letter+1)	0.437***	−0.0494
	(16.91)	(−0.86)
ln (gift+1)	0.350***	0.170***
	(31.95)	(9.54)
heat	0.0766***	0.132***
	(4.88)	(6.70)
Constant	3.314***	3.487***
	(34.29)	(26.51)
N	5,616	4,598
R 2	0.579	0.238
F	460.07***	85.60***

t-values in parentheses;

^***p < 0.01,

^**p < 0.05.