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Table 1 The definitions of the key variables

From: The effect of the presence of children on adult smoking behaviour: empirical evidence based on China family panel studies

Variable Definition Mean Std. Min Max
Smoker If respondents smoked in last month = 1; otherwise = 0 0.289 0.456 0 1
Married If respondents are married or cohabitating with others = 1; otherwise = 0 0.833 0.373 0 1
Number of children Number of children in a family 1.231 2.856 0 9
Age gap The age difference between couple 2.09 3.31 −26 29
Years of education Years of education 6.73 4.86 0 22
Age The age of respondent in years 46.591 15.796 16 110