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. 2008 Dec 8;337:a2396. doi: 10.1136/bmj.a2396

Table 7.

 Length of labour (hours) by number of admissions before labour. Values are mean (SD) unless stated otherwise

Experimental Control
Before (n=1029) After (n=892) Before (n=1291) After (n=1279)
Admission to delivery
Previous admissions:
 0 7.72 (5.09) 9.61 (6.02) 7.30 (5.01) 7.81 (5.43)
 1 8.50 (5.81) 8.50 (5.42) 8.57 (5.07) 8.38 (5.30)
 2 8.46 (4.83) 11.52 (23.77) 9.92 (4.84) 8.55 (5.36)
 3 13.00 (14.55) 9.57 (3.95) 8.11 (5.07) 10.46 (6.61)
 4 0 11.82 (11.65) 4.45 (2.99) 12.24 (3.83)
 5 0 0 0 0
 6 0 0 0 12.90*
Missing data 109 51 98 77
Duration of active labour
Previous admissions:
 0 9.74 (5.10) 11.31 (5.67) 9.19 (4.88) 9.50 (5.14)
 1 10.37 (5.77) 10.47 (5.69) 9.93 (5.06) 9.31 (4.97)
 2 9.67 (5.69) 10.10 (4.73) 11.46 (4.75) 10.32 (6.12)
 3 9.34 (6.20) 11.67 (5.25) 10.79 (5.45) 11.06 (5.00)
 4 0 6.15 (2.7) 10.76 (4.48) 14.61 (2.23)
 5 0 0 0 0
 6 0 0 0 12.90*
Missing data 145 69 112 98

*One woman only.