Table 4.

Differences in months in age at death across levels of sleep duration in the Swedish National March Cohort

Sleep duration, hours/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
≤5 h	486	40,469	−8.8	−15.3, −2.3	−6.7	−12.9, −0.5	−7.0	−12.8, −1.2
6 h	761	116,938	−0.5	−5.9, 4.9	−0.3	−5.5, 4.8	−0.9	−6.0, 4.1
7 h	1255	215,222	0	Referent	0	Referent	0	Referent
≥8 h	1046	124,483	−9.5	−14.7, −4.4	−6.9	−11.5, −2.2	−6.9	−11.5, −2.2
Model 2b
≤5 h	337	31,571	−8.5	−16.7, −0.4	−6.2	−13.2, 0.9	−6.5	−13.4, 0.4
6 h	564	95,917	1.4	−4.8, 7.7	1.7	−4.2, 7.6	0.2	−5.5, 5.8
7 h	984	181,815	0	Referent	0	Referent	0	Referent
≥8 h	805	103,352	−6.6	−12.4, −0.7	−5.3	−10.6, 0.1	−3.6	−9.1, 1.9

PD percentile difference

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

^bThe model was further adjusted for sex, body mass index, smoking status, alcohol consumption, educational level, physical activity and major diseases