Table 5 Cox proportional hazards regression models for the association between sleep duration and incident coronary heart disease

Sleep duration Q1 (4.00–6.57 h)

1.53**

(1.14, 2.06)

1.39*

(1.02, 1.88)

1.37*

(1.01, 1.86)

Sleep duration Q2 (6.64–7.14 h)

1.37*

(1.01, 1.88)

1.34

(0.98, 1.84)

1.35

(0.99, 1.85)

Sleep duration Q3 (7.21–7.57 h)

Reference

Reference

Reference

Sleep duration Q4 (7.64–8.00 h)

1.21

(0.89, 1.64)

1.20

(0.88, 1.64)

1.22

(0.89, 1.66)

Sleep duration Q5 (8.14–11.00 h)

1.24

(0.86, 1.78)

1.19

(0.83, 1.72)

1.23

(0.85, 1.77)