Table 1.

Maternal demographic and baseline characteristics (modified intention-to-treat population)

Characteristics	Lateral episiotomy (n=344)	No episiotomy (n=358)
Age (years), median (range)	31 (19-43)	31 (21-47)
Age (years):
<19	1 (<1)	0
20-24	22 (6)	20 (6)
25-29	100 (29)	115 (32)
30-34	149 (43)	134 (37)
≥35	72 (21)	89 (25)
Country of birth:
Sweden	266 (77)	286 (80)
Other European	33 (10)	20 (6)
Outside Europe	23 (7)	26 (7)
Missing	22 (6)	26 (7)
Educational level:
None or less than nine years	1 (<1)	2 (1)
Compulsory school (nine years)	7 (2)	11 (3)
Upper secondary school (gymnasium)	104 (30)	76 (21)
University/college	205 (60)	231 (65)
Missing	27 (8)	38 (11)
Height (cm):
Median (range)	166 (150-185)	167 (147-182)
<160	34 (10)	44 (13)
Missing	4 (1)	7 (2)
Body mass index:
Median (range)	23.7 (17.7-50.1)	23.7 (16.6-44.5)
≤18.4	6 (2)	8 (2)
18.5-24.9	207 (60)	207 (58)
25.0-29.9	88 (26)	99 (28)
30.0-4.9	23 (7)	20 (6)
≥35.0	11 (3)	15 (4)
Missing	9 (3)	9 (3)
Pregnancy complications:
PROM/PPROM	50 (15)	60 (17)
Hypertensive disease/pre-eclampsia	33 (10)	38 (11)
Gestational and pregestational diabetes mellitus	20 (6)	26 (7)
Intrauterine growth restriction/oligohydramniosis	11 (3)	12 (3)
Accelerated growth/macrosomia	9 (3)	12 (3)
Study site:
Uppsala University Hospital	92 (27)	92 (26)
Danderyd University Hospital	80 (23)	83 (23)
Falun Hospital	69 (20)	78 (22)
Helsingborg Hospital	37 (11)	33 (9)
Umeå University Hospital	15 (4)	20 (6)
South General Hospital	19 (6)	16 (5)
Östra Sahlgrenska University Hospital	14 (4)	19 (5)
Växjö Hospital	18 (5)	17 (5)

Data are number (percentage), unless otherwise specified.

PROM=prelabour rupture of membranes; PPROM=preterm, prelabour rupture of membranes.