Table 3 Incidence of interventions and adverse outcomes in ‘low risk’ women by planned place of birth and parity

Adverse perinatal outcome

n/1000 (95% CI)

n/1000 (95% CI)

n/1000 (95% CI)

n/1000 (95% CI)

 ‘Birthplace primary perinatal outcome’

4.5

4.7

2.7

2.4

(2.8-7.1)

(3.1-7.2)

(1.6-4.6)

(1.4-4.3)

Maternal interventions and adverse outcomes

% (99% CI)

% (99% CI)

% (99% CI)

% (99% CI)

 ‘Straightforward vaginal birth’

78.8

71.5

97.0

94.6

(75.9-81.5)

(68.1-74.7)

(96.3-97.6)

(93.3-95.6)

 Instrumental delivery (ventouse or forceps)

10.8

16.3

1.1

2.5

(8.7-13.3)

(13.9-19.1)

(0.7-1.6)

(1.9-3.3)

 Intrapartum caesarean section

6.7

7.7

0.7

1.0

(5.5-8.1)

(6.3-9.3)

(0.5-1.1)

(0.7-1.5)

 Third or fourth degree perineal trauma

4.0

4.9

0.9

1.6

(3.1-5.1)

(4.0-6.0)

(0.6-1.4)

(1.2-2.1)

 Blood transfusion

0.8

1.3

0.3

0.6

(0.5-1.1)

(0.9-1.7)

(0.2-0.6)

(0.4-0.8)

 Maternal admission for higher level care

0.2

1.0

0.1

0.4

(0.1-0.5)

(0.4-2.8)

(0.0-0.3)

(0.2-0.7)