Table 1 Number of observations
Data | Number excluded | Number remaining |
|---|---|---|
CHNS 1991, 1993, 1997, 2000, 2004, 2006, 2009 | 94,812 | |
Restrict to observations with age 13–18 | 89,871 | 4941 |
Exclude if smoking status is missing | 408 | 4533 |
Exclude if mother or father’s age is missing | 10 | 4523 |
Exclude if household income is missing | 27 | 4496 |
Exclude if mother or father’s education is missing | 128 | 4368 |