Table 1.

Baseline Distribution of Adolescents Reporting No Sleep Problems in 1989 and Proportion Developing Sleep Problems or Frequent Sleep Problems by 1993

Baseline DemographicsnFollow-Up
Sleep
Problems
% (95% Confidence Interval)
Frequent
Sleep Problems
% (95% Confidence Interval)
Overall486628.5 ± 1.39.0 ± .8
Sex
 Male263324.9 ± 1.87.4 ± 1.0
 Female223332.6 ± 2.010.8 ± 1.3
Age group (y)
 12–14214429.8 ± 2.08.6 ± 1.2
 15–16133327.7 ± 2.49.3 ± 1.7
 17–18138927.2 ± 2.59.2 ± 1.5
Race/ethnicity
 White363827.7 ± 1.58.7 ± .9
 Black70729.8 ± 3.410.7 ± 2.6
 Hispanic36731.2 ± 4.89.4 ± 2.9
 Asian/other15431.8 ± 8.65.0 ± 3.3
Perceived school performance
 Much better86827.6 ± 3.17.3 ± 1.9
 Better185127.1 ± 2.27.9 ± 1.4
 Average/below214730.1 ± 1.910.6 ± 1.3