Skip to main content

Table 3 Crude and adjusted relative risks (RR) with 95 % confidence interval (CI) for adverse outcomes by maternal age in a low-risk population of primiparous women delivering singletons in cephalic version at term (≥37 gestational weeks). Norway, 1999 − 2009, n = 169,583

From: Elective cesarean section or not? Maternal age and risk of adverse outcomes at term: a population-based registry study of low-risk primiparous women

Maternal age (years)

<20

20 − 24

25 − 29

30 − 34

≥35

Deliveries (n, %)

(9398; 5.5 %)

 

(43,658; 25.7 %)

(67,338; 39.7 %)

 

(38,190; 22.5 %)

 

(9615; 5.7 %)

 
 

RRc (95 % CI)

RRadj (95 % CI)a

 

RRc (95 % CI)

RRadj (95 % CI)a

RRc (95 % CI)

RRadj(95 % CI)a

RRadj (95 % CI)

RRadj (95 % CI)a

Maternal complications

 Blood loss 500 − 1500 ml

0.86 (0.80-0.92)

0.91 (0.85-0.98)

1

1.16 (1.12-1.20)

1.09 (1.05-1.13)

1.31 (1.26-1.36)

1.12 (1.08-1.17)

1.48 (1.40-1.56)

1.13 (1.07-1.19)

 Blood loss ≥ 1500 ml

0.82 (0.64-1.05)

0.85 (0.66-1.09)

1

1.14 (1.01-1.29)

1.09 (0.97-1.23)

1.40 (1.23-1.59)

1.24 (1.08-1.41)

1.89 (1.60-2.24)

1.49 (1.25-1.77)

 Transfer to ICU

1.03 (0.58-1.84)

1.02 (0.56-1.86)

1

1.30 (0.96-1.75)

1.26 (0.93-1.71)

1.78 (1.30-2.44)

1.54 (1.12-2.13)

1.64 (1.01-2.59)

1.17 (0.73-1.86)

Neonatal complications

 Apgar < 7 at 5 min

0.91 (0.73-1.12)

0.97 (0.78-1.21)

1

1.08 (0.97-1.20)

1.00 (0.90-1.12)

1.23 (1.09-1.39)

1.01 (0.89-1.14)

1.58 (1.34-1.86)

1.12 (0.95-1.33)

 Apgar < 4 at 5 min

1.07 (0.70-1.64)

1.09 (0.71-1.69)

1

1.23 (0.98-1.55)

1.21 (0.96-1.52)

1.32 (1.02-1.69)

1.18 (0.91-1.52)

2.04 (1.48-2.80)

1.63 (1.17-2.26)

 NICU

0.91 (0.82-1.00)

0.97 (0.87-1.07)

1

1.08 (1.02-1.13)

0.98 (0.93-1.04)

1.23 (1.16-1.30)

1.02 (0.96-1.08)

1.41 (1.30-1.52)

1.05 (0.97-1.14)

 Respiratory

0.80 (0.65-0.98)

0.87 (0.71-1.06)

1

1.13 (1.03-1.24)

1.03 (0.94-1.14)

1.26 (1.13-1.40)

1.04 (0.93-1.15)

1.44 (1.24-1.67)

1.06 (0.91-1.23)

 Cerebral

0.84 (0.61-1.16)

0.95 (0.69-1.31)

1

1.11 (0.95-1.29)

0.97 (0.82-1.13)

1.25 (1.05-1.48)

0.94 (0.79-1.12)

1.82 (1.46-2.28)

1.20 (0.96-1.51)

 Infection

0.71 (0.59-0.85)

0.78 (0.65-0.93)

1

1.12 (1.04-1.22)

1.03 (0.95-1.12)

1.35 (1.23-1.47)

1.10 (1.01-1.21)

1.76 (1.57-1.98)

1.29 (1.14-2.15)

  1. RRc crude relative risk, RRadj adjusted relative risk, ICU Intensive care unit, NICU Neonatal intensive care unit;a Adjusted for year of delivery, country, hospital, elective caesarean section, gestational age
Back to article page

BMC Pregnancy and Childbirth

ISSN: 1471-2393

Contact us