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Notes / Data Problems

Sampling-Unit Variables (T1-T5)

The original sampling-unit variables T1 through T5 were concatenated to form community and household ID variables (COMMID, HHID). They are still kept in master longitudinal files, although they contribute no unique information.

Area of Residence Variables

Area of residence variables (STRATUM and URBAN) can be constructed from the original sampling-unit variables. The short SAS program that constructed these variables is available upon request by sending an email message to

Incorrect Variable Names

Several variables were named incorrectly in the original 1997 and 2000 Chinese questionnaires. The translated English questionnaires include the original name, with the corrected name as it appears in the data file enclosed in [brackets] to the right or below the original name.