CLOCKST is a 4-digit numeric variable.
CLOCKST represents the time on the 24-hour clock when the episode started.
This variable is reported as a 4-digit numeric variable. The digit(s) prior to the decimal represent the hour; the two digits following the decimal represent the minute. For example:
6.35 (thirty five minute past 6AM)
18.05 (five minutes past 6PM)
All the surveys included in the MTUS cover an observation period of 24 hours (1440 minutes), and all surveys begin at a point on the 24-hour clock where the majority of the observed population was asleep. There is considerable variability about the start-time on the 24-hour clock, both in the sense that the start time of the diaries varies from midnight to 6:00, and that the time when the diarists in different surveys (as well as in the same survey in the case of countries that span multiple time zones) start their diary in relation to Greenwich Mean Time.
- All activities.
- Austria: 1992
- Bulgaria: 2001
- Canada: 2005, 2010
- Finland: 1979, 2009
- France: 1985, 2009
- Hungary: 1999, 2009
- Israel: 1991
- Italy: 2002, 2008
- Netherlands: 1975, 1980, 1985, 1990, 1995, 2000, 2005
- South Africa: 2000, 2010
- South Korea: 2009
- Spain: 2002, 2009
- United Kingdom: 1974, 1983, 1987, 2000, 2014
- United States: 1965, 1975, 1985, 1993, 1995, 1998, 2003-2018