Table 1.

Characteristics of the study population

Variables	Total sample n = 682	Subsample in CFA n = 615
Maternal age, years, mean (SD)	31.4 (4.6)	31.4 (4.6)
Number of births, mean (SD)	1.69 (0.8)	1.67 (0.8)
Primiparous	320 (46.9)	293 (47.6)
Multiparous	359 (52.6)	319 (51.9)
Oxytocin augmentation	179 (26.2)	161 (26.2)
Active labor, duration > 12 h	175 (25.7)	156 (25.4)
Spontaneous vaginal birth	596 (87.4)	542 (88.1)
Instrumental vaginal birth	39 (5.7)	36 (5.9)
Emergency caesarean	46 (6.7)	37 (6.0)

Data are given as as n (%) or mean (SD)

CFA Confirmatory Factor Analysis