Table 4.

Sleeping patterns versus non-invasive vascular measurements

		CIMT (mm)		PWV (m/s)		Distensibility (10−3 kPa−1)
		Age adjustedmean (95% CI)	Additional adjustment*mean (95% CI)	Age adjustedmean (95% CI)	Additional adjustment mean (95% CI)	Age adjustedmean (95% CI)	Additional adjustment mean (95% CI)
Night-time sleep duration (hours)	<6 (n=209†)	0.81 (0.78 to 0.83)	0.8 (0.78 to 0.82)	10.48 (10.24 to 10.71)	10.45 (10.22 to 10.69)	11.66 (11.11 to 12.21)	11.62 (11.06 to 12.18)
	6–8.9 (n=1125†)	0.81 (0.8 to 0.82)	0.81 (0.8 to 0.82)	10.18 (10.08 to 10.27)	10.18 (10.08 to 10.28)	12.29 (12.06 to 12.53)	12.31 (12.08 to 12.55)
	≥9 (n=95†)	0.82 (0.79 to 0.85)	0.82 (0.79 to 0.85)	10.25 (9.91 to 10.6)	10.25 (9.9 to 10.59)	11.71 (10.9 to 12.51)	11.81 (11 to 12.63)
	p	0.67	0.64	0.07	0.11	0.06	0.06
Daytime sleep duration (hours)	0 (n=677†)	0.81 (0.79 to 0.82)	0.81 (0.8 to 0.82)	10.25 (10.12 to 10.38)	10.25 (10.12 to 10.38)	12.23 (11.93 to 12.53)	12.2 (11.89 to 12.5)
	<1 (n=290†)	0.81 (0.79 to 0.82)	0.81 (0.79 to 0.82)	10.15 (9.96 to 10.35)	10.16 (9.96 to 10.36)	12.49 (12.03 to 12.96)	12.5 (12.04 to 12.97)
	1 (n=334†)	0.8 (0.79 to 0.82)	0.8 (0.78 to 0.82)	10.2 (10.01 to 10.38)	10.2 (10.01 to 10.38)	11.81 (11.38 to 12.25)	11.88 (11.44 to 12.32)
	>1 (n=128†)	0.84 (0.81 to 0.87)	0.83 (0.8 to 0.86)	10.29 (9.99 to 10.6)	10.29 (9.98 to 10.6)	11.96 (11.25 to 12.67)	12.12 (11.39 to 12.85)
	p	0.17	0.37	0.80	0.85	0.18	0.30

* Adjusted for age, BMI, social class and physical activity.

^† Maximum n in group.

CIMT, carotid intima-media thickness; PWV, pulse wave velocity.