Table 4.

VAS for each time of the day

	Night (00:00–08:00)	Office hours (08:00–16:00)	Evening (16:00–00:00)	P value	P value
				(Night)*	(Office hours)*
No of primiparas	15 311	16 631	16 288
Mean VAS
Crude (SE)	7.90 (0.014)	8.00 (0.013)	7.87 (0.013)	0.112	<0.001
Adjusted† (SE)	7.91 (0.014)	7.97 (0.013)	7.90 (0.013)	0.570	<0.001
95% CI	7.88 to 7.94	7.94 to 7.99	7.87 to 7.92
Low VAS (1–5)	9.4%	8.8%	10.3%
No of multiparas	18 530	20 401	18 685
Mean VAS
Crude (SE)	8.58 (0.010)	8.55 (0.010)	8.52 (0.010)	<0.001	0.057
Adjusted† (SE)	8.56 (0.010)	8.57 (0.010)	8.52 (0.010)	0.005	0.001
95% CI	8.54 to 8.58	8.55 to 8.59	8.50 to 8.54
Low VAS (1–5)	3.6%	4.1%	4.3%

*Reference group is Evening (16:00–00:00).

†Adjusted by mother’s age, body mass index before pregnancy, gestational age, fear of childbirth, partnership status and mode of delivery.

VAS, Visual Analogue Scale.