Table 2.

Results of univariate analysis of the course of labour group of observed outcomes between the study group (age ≤19 years) or the study subgroup (age ≤17 years) and the control group (age 20–24 years) of primiparous women, Slovenia, 2008–2012.

	Control group	Study group		Study subgroup
The course of labour	20–24 years (N=12,112)	≤19 years (N=1,413)		≤17 years (N=318)
	n (%)	n (%)	P*	n (%)	P*
Onset of labour
Spontaneous	9197 (76.1)	1.152 (81.7)	<0.001	269 (84.6)	0.006
Administration of PGE2	1.451 (12.0)	139 (9.9)	<0.001	25 (7.9)	0.006
Artificial rupture of membranes	971 (8.0)	79 (5.6)	<0.001	16 (5.0)	0.006
Elective Caesarean section	465 (3.8)	40 (2.8)	<0.001	8 (2.5)	0.006
Augmentation with oxytocin	7751 (64.0)	875 (61.9)	0.126	188 (59.1)	0.074
Foetal position
Occipito-anterior foetal position	10857 (88.7)	1270 (89.2)	0.927	280 (87.8)	0.614
Other foetal head positions	785 (7.4)	89 (6.3)	0.927	25 (7.8)	0.614
Breech presentations	567 (4.6)	61 (4.3)	0.927	14 (4.4)	0.614
Delay of cervical dilatation	252 (2.1)	15 (1.1)	0.09	1 (0.3)	0.028
Incorrect descent of the presenting part	754 (6.2)	67 (4.7)	0.027	16 (5)	0.383
Foetal distress	503 (4.2)	62 (4.4)	0.676	13 (4.1)	0.954
Labour dystocia	84 (0.7)	9 (0.6)	0.808	5 (1.6)	0.067
Instrumental intervention (vacuum, forceps)	556 (4.5)	62 (4.4)	0.001	18 (5.6)	0.040
Emergency Caesarean section	2006 (16.4)	180 (12.6)	0.001	36 (11.3)	0.040
Episiotomy	5432 (44.9)	482 (44.0)	0.872	155 (48.7)	0.169
Maternal injuries
Minor injuries	2937 (24.2)	298 (21.1)	0.008	75 (23.6)	0.785
Uterine cervix injury	199 (1.6)	25 (1.8)	0.725	9 (2.8)	0.103
Severe injuries	46 (0.4)	4 (0.3)	0.571	0 (0.0)	0.271
Complications of the third stage of labour	420 (3.5)	48 (3.4)	0.891	17 (5.3)	0.073
Labour without complications	8902 (73.5)	1061 (75.1)	0.199	255 (80.2)	0.007

Legend:

^*comparison to the control group - χ² test