A total of 20,566 people aged 15 and over were surveyed
in Bangkok and in the four regions of Thailand: North,
Northeast, Central and South. The household-level
response rate was 97.9%, the individual-level response rate
was 96.2%, and the overall response rate, a product of
household response rate and individual response rate, was
94.2%. Each of the four non-Bangkok regions had high
response rates, with at least 95.1% overall, at least 98.4% at
the household level, and at least 96.2% at the individual
level. The response rate in the Bangkok metropolitan area
was 94.6% at the household level, 90.0% at the individual
level, and 85.1% overall.