Table 2: Descriptive data of the patients subdivided according to the route of delivery and infant weight.

Route of deliveryInlet mm mean (SD)Outlet mm mean (SD)First stage of the delivery, minutes mean (SD)Second stage of the delivery, minutes mean (SD)Infant weight g mean (SD)Apgar 1-minute mean (SD)

All ( )401 (22)361 (20)519 (284)50 (38)3750 (509)8.6 (1.1)
Spontaneous vaginal delivery ( )402 (22)362 (20)483 (282)40 (31)3750 (534)8.6 (0.95)
Operative vaginal delivery 399 (21)357 (18)615 (280)94 (31)3760 (378)8.2 (1.4)
-value0.230.840.66<0.010.800.06

Infant weight < 3700 g ( )392 (19)351 (17)521 (303)49 (33)3300 (291)8.5 (1.0)
Spontaneous vaginal delivery ( )391.5 (18)352 (17)515 (309)40 (29)3270 (302)8.7 (0.7)
Operative vaginal delivery ( )393 (19)347 (15)543 (282)85 (27)3430 (193)7.8 (1.8)
-value0.230.930.560.010.61<0.01

Infant weight ≥ 3700 g ( )409 (20) 370 (18)501 (267)51 (41)4120 (318)8.6 (1.1)
Spontaneous vaginal delivery ( )410 (20)370 (18)457.1 (256)40 (34)4130 (327)8.6 (1.1)
Operative vaginal delivery ( )402 (22)365.5 (16)675 (270)102 (32)4030 (259)8.6 (0.9)
-value0.370.310.65<0.010.780.82

SD: standard deviation.