Table 1 Operationalization of variables
From: Effect of self-employment on the sub-health status and chronic disease of rural migrants in China
Variable | Description | Items |
|---|---|---|
Dependent variables | ||
 Chronic disease | =1 if one suffer from Hypertension or Diabetes; =0 otherwise; | Question: Do you suffer from Hypertension or Diabetes diagnosed by your doctor? |
 Sub-health status | =1 if one is in sub-health status; =0 otherwise; | Question: How is your health? |
Focal variable | ||
 Self-employment | =1 if one is self-employed; =0 if wage-employed; | Question: What is your employment status? |
Control variables | ||
 Socio-economic characteristics | ||
  Gender | =1 if male; =0 if female; | Question: What is your gender? |
  Age | 15 ≤ age ≤ 96; | Question: Year of birth |
  Age^2 | Age squared; | Question: Year of birth |
 Educational attainment | ||
  Primary school or below | =1 if education year≤6, =0 otherwise | Question: What’s your education level? |
  Junior high school | =1 if 6 < education year≤9, =0 otherwise | Question: What’s your education level? |
  Senior high school | =1 if 9 < education year≤12, =0 otherwise | Question: What’s your education level? |
  College or above | =1 if education year> 12, =0 otherwise | Question: What’s your education level? |
 Income (monthly), Ұ | Net income for last month at time of interview | Question: How much was your salary last month? |
 Marital status | =1 if married;=0 if unmarried; | Question: What’s your marital status? |
 Work characteristic | ||
  Construction industry | =1 if one works in construction industry;=0 otherwise; | Question: What’s do you work in industry? |
  Service industry | =1 if one works in service industry;=0 otherwise; | Question: What’s do you work in industry? |
  Other industry | =1 if one works in other industry;=0 works in construction or service industry; | Question: What’s do you work in industry? |
 Migration traits | ||
  Children migration | =1 if children migrates together only; =0 otherwise | Question: What is your relationship with the interviewee? |
  Couple migration | =1 if couple migrates together only; =0 otherwise | Question: What is your relationship with the interviewee? |