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CODE ALL THAT APPLY
PROMPT AS NECESSARY
97 hours or more = 97
Don't know or refusal = 99
Universe
Location of units of observation: National;Population: All persons normally resident in private households in Great Britain and (from 1994) Northern Ireland.
Sampling
Simple random sample;Four sampling frames are used. See documentation for details.
Study Type
Repeated cross-sectional study; Data are collected quarterly