| Variable | β, standard error | t statistic (2-sided p-value) |
---|---|---|---|
All Subjects | Length-of-night | 0.1081, 0.0612 | 1.76 (0.08) |
 | Age | −0.0113, 0.0066 | −1.79 (0.09) |
 | SES | 0.1375, 0.0637 | 2.16 (0.03) |
Ages > 55 years | Length-of-night | 0.2341, 0.0963 | 2.43 (0.02) |
 | Age | −0.0284, 0.0152 | −1.87 (0.06) |