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. 2019 Mar 15;18:44. doi: 10.1186/s12939-019-0942-1

Table 1.

Descriptions of the Variables

Variables Obs Mean/percent SD Value Value label
Dependent variables
 Days of poor physical health 3322 2.581 6.188 0–30
 Days of poor mental health 3330 3.297 6.964 0–30
 Days of activity limitation 3325 1.230 4.062 0–30
 Assessment of general health 3329 3.652 1.015 1–5 1 = poor, 5 = excellent
Independent variable
 Income ($) 3042 38,281.08 33,832.01 236.5–144,502.7
Mediator
 Social networking time 3330 54.972 91.971 0–300
Control variables
 Age 3320 42.898 13.308 18–88
 Sex (male) 3330 48.02% 0,1 1 = male
0 = female
 Race (white) 3330 75.56% 0,1 1 = white
0 = non-white
 Marital status (married) 3329 47.10% 0,1 1 = married
0 = not married
 Working status (working) 3330 97.36% 0,1 1 = working, 0 = not working
 Geographic mobility (same city since age 16) 3325 39.01% 0,1 1 = same city since age 16,
0 = not the same city
 Number of children 3327 1.597 1.483 0–8
 Place of living (urban) 3330 89.13% 0,1 1 = urban, 0 = rural