Table 1.

Variables and coding in the analysis for never-smoking women in Inner Mongolia, 2015

Variables	Categories
Exposure to SHS	No exposure to SHS=0, exposure to SHS=1
Age	Older women=0, middle-aged women=1, young women=2
Ethnicity	Han=0, Mongolian=1, Other ethnicity=2
Marital status	Single=0, married=1, widowed/divorced=2
Education level	Low (illiterate)=0, middle (junior school)=1, high (senior high school and above)=2
Occupation	Unemployed=0, employed=1, retired=2
Residential area	Urban=0, rural=1

SHS: secondhand smoke.