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. 2020 Oct 13;17(20):7432. doi: 10.3390/ijerph17207432

Table 2.

Definitions of variables.

Variable Name Variable Definitions
SI Binary dummy variable, standing for settlement intention of the migrant. If migrant i decides to settle down in city j, it is 1; otherwise, 0.
PM2.5 Air quality of cities, measured using the annual average PM2.5 concentration (μg/m3) of the Chinese city where the migrant resides.
income Monthly personal income in the immigratory city of the migrant (10,000 yuan)
nation Dummy variable, the national/ethnic group of the migrant: ethnic Han = 1, others = 0.
gender Dummy variable, gender of the migrant: male = 1, female = 0.
age Age of the migrant (years).
marriage Dummy variable, marital status of the migrant: married = 1, unmarried = 0.
party Dummy variable, political identity of the migrant: China Communist Party (CCP) member or Chinese Communist Youth League (CCYL) member = 1, otherwise = 0.
edu Level of education, measured in terms of the educated years of the migrant: never gone to school = 0 year, primary school = 6 years, junior high school = 9 years, senior high school = 12 years, junior college = 15 years, undergraduate = 16 years, graduate or above = 19 years.
hukou Dummy variable, the “hukou” status of the migrant: non-agricultural “hukou” = 1, agricultural “hukou” = 0.
time Duration of residence in the immigratory city of the migrant (year).
distance 1 Dummy variable, spatial distance of migration for the migrant: migration crossing provincial border = 1, others = 0.
distance 2 Dummy variable, spatial distance of migration for the migrant: migration crossing city border = 1, others = 0.
distance 3 Dummy variable, spatial distance of migration for the migrant: migration crossing county border = 1, others = 0.
reason Dummy variable, reason for migration for the migrant: economic purpose (work or business) = 1, non-economic purpose (trailing family member, marriage, or other reasons) = 0.
third The proportion of tertiary industries in the city where the migrant resides in (%), expressed as the ratio between output value of the tertiary industry and the GDP.
trade Dependence degree on the trade of the city where the migrant resides in (%), expressed as the ratio of the total export and import volumes to the GDP.
pgdp Per capita GDP of the city where the migrant resides in (10,000 yuan).
gdpr GDP growth rate of the city where the migrant resides in (10,000 yuan).