Table 3 Robustness check of subgroup regression (IV-probit)

Internet use frequency

0.268***

0.440**

0.295***

0.310**

0.233**

0.599*

(0.074)

(0.158)

(0.089)

(0.112)

(0.075)

(0.264)

Age

0.002

0.006

0.004

0.001

−0.000

0.012

(0.002)

(0.004)

(0.003)

(0.002)

(0.002)

(0.007)

Marital status

0.078**

0.021

–

–

0.043

0.056

(0.026)

(0.029)

–

–

(0.025)

(0.040)

Education

−0.040**

−0.011

− 0.010

− 0.034

−0.027*

− 0.023

(0.014)

(0.008)

(0.006)

(0.018)

(0.013)

(0.015)

Household registration

–

–

0.019

0.152***

0.107**

−0.083

–

–

(0.031)

(0.042)

(0.034)

(0.108)

Number of children

−0.004

0.008

0.012

−0.007

−0.006

0.015

(0.011)

(0.015)

(0.012)

(0.016)

(0.011)

(0.020)

Living environment

0.025

0.077

0.084**

0.029

0.053*

0.070

(0.023)

(0.045)

(0.026)

(0.037)

(0.024)

(0.055)

Industry

0.032

−0.052

−0.023

0.007

–

–

(0.042)

(0.040)

(0.028)

(0.040)

–

–

Logarithm of total income

−0.002

− 0.025

0.002

− 0.021

−0.007

− 0.011

(0.009)

(0.016)

(0.010)

(0.014)

(0.009)

(0.020)

Lifestyle of regular exercise

−0.061**

−0.145***

− 0.117***

−0.070*

− 0.056*

−0.168***

(0.022)

(0.032)

(0.023)

(0.030)

(0.025)

(0.043)

Social capital

0.003*

−0.005

−0.000

0.004

0.003

−0.010

(0.002)

(0.004)

(0.002)

(0.003)

(0.002)

(0.009)

Central province

0.055

0.567***

0.261***

0.367***

0.138**

0.669**

(0.037)

(0.143)

(0.069)

(0.109)

(0.043)

(0.218)

Western province

0.145*

0.519***

0.283***

0.416**

0.150**

0.748***

(0.059)

(0.153)

(0.085)

(0.134)

(0.051)

(0.203)

Northeast province

−0.060

0.183

0.011

0.102

−0.025

0.331

(0.031)

(0.146)

(0.063)

(0.103)

(0.039)

(0.282)

Observations

1112

1601

1678

1035

1328

1385