Table 2.

Quantile regression analysis for percentile differences (PD) in months in age at death across levels of weekday/weekend sleep duration groups in the Swedish National March Cohort

Sleep duration, hr per day	No. of deaths	Person‐years	25th PD, months		50th PD, months		75th PD, months
			PD	95% CI	PD	95% CI	PD	95% CI
Model 1a
Short‐short	323	19,310	−7.8	−15.4, −0.2	−5.6	−13.0, 1.7	−6.2	−12.7, 0.3
Short‐medium/long	85	18,356	−8.4	−21.3, 4.5	−7.8	−19.5, 4.0	−4.5	−17.1, 8.1
Medium‐medium	1,302	134,434	0.0	Reference	0.0	Reference	0.0	Reference
Medium‐long	503	186,408	5.5	−0.9, 12.0	5.6	−0.7, 11.9	6.5	−0.2, 13.2
Long‐long	918	115,555	−7.7	−13.1, −2.2	−5.3	−10.1, −0.6	−4.7	−9.4, 0.0
Long‐short	103	9,078	−3.9	−15.4, 7.6	−7.9	−17.8, 2.1	−9.6	−19.3, 0.0
Model 2b
Short‐short	194	12,565	−9.2	−18.2, −0.2	−9.7	−18.6, −0.8	−7.5	−16.5, 1.5
Short‐medium/long	56	14,435	−6.1	−19.4, 7.2	−3.4	−20.1, 13.2	−0.1	−15.5, 15.3
Medium‐medium	859	100,901	0.0	Reference	0.0	Reference	0.0	Reference
Medium‐long	384	154,640	3.4	−3.6, 10.5	2.7	−4.5, 9.9	5.4	−2.4, 13.2
Long‐long	623	89,484	−5.9	−12.1, 0.3	−3.6	−9.8, 2.5	−0.3	−6.0, 5.3
Long‐short	62	6,479	−3.6	−16.5, 9.3	−9.3	−22.3, 3.6	−8.2	−22.2, 5.8

CI, confidence interval; PD, percentile differences.

^aEstimates were obtained by fitting a Laplace regression on the 25th, 50th and 75th percentiles of age at death adjusted for age at baseline.

^bThe model was further adjusted for sex, BMI, smoking status, alcohol consumption, educational level, physical activity, shift work and Charlson index.