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Tuesday, March 20, 2007

The University of Maryland study stands out because it relied on activity-by-activity "time diary" accounts of how Americans spend their days, which experts say are more reliable than survey questions about parenting.

Respondents are walked through a 24-hour period, detailing each activity, even if it was brief. They are not told that there is an interest in parents' time use or any other trend.

The national study, first done from the University of Michigan in 1965, was conducted again in 1975, 1985 and 1995 and several dates around 2000.

More recently, the federal Bureau of Labor Statistics started a similar time-use survey, and the Maryland researchers have drawn on that for their most recent data, for 2003.

The researchers-- Suzanne M. Bianchi, John P. Robinson and Melissa A. Milkie-- compiled many of their results in the book "Changing Rhythms of American Family Life," published in the fall by the Russell Sage Foundation.



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