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Table 2 Effect of birthplace on birth outcomes by parity

From: Are freestanding midwifery units a safe alternative to obstetric units for low-risk, primiparous childbirth? An analysis of effect differences by parity in a matched cohort study

 

Primiparous women

FMU/OU

(n = 215)/(n = 215)

Multiparous women

FMU/OU

(n = 624)/(n = 624)

Effect ratio

Primiparas/multiparas

OR (95% CI)

OR (95% CI)

OR (95% CI)

Primary outcomes

 Uncomplicated birth

2.2 (1.4–3.3)

2.9 (2.0–4.2)

0.7 (0.4–1.3)

 Caesarean section

0.4 (0.2–0.9)

0.8 (0.3–2.2)

0.6 (0.2–2.1)

Secondary outcomes

 Perinatal:

  Apgar score <9/5 min

0.6 (0.2–1.9)

0.8 (0.4–1.9)

0.8 (0.2–3.0)

  NICU admission <24 h

0.8 (0.4–1.9)

0.7 (0.3–1.8)

1.2 (0.3–4.3)

  Infant readmission

0.4 (0.1–1.4)

0.7 (0.4–1.3)

0.6 (0.2–2.2)

 Maternal:

  Intact perineum

1.3 (0.9–1.9)

1.3 (1.02–1.7)

1.0 (0.6–1.6)

  3rd-4th degree tear

0.9 (0.4–2.0)

0.6 (0.2–1.7)

1.7 (0.4–6.4)

  Maternal readmission

0.3 (0.1–0.9)

0.8 (0.4–1.4)

0.4 (0.1–1.3)

 Other:

  Instrumental delivery

0.4 (0.2–0.7)

0.3 (0.1–0.9)

1.5 (0.4–6.2)

  Augmentation of labour

0.4 (0.3–0.6)

0.3 (0.2–0.5)

1.3 (0.6–2.7)

  Epidural analgesia

0.4 (0.3–0.8)

0.2 (0.1–0.4)

2.5 (0.9–7.0)

  Water birth

2.4 (1.2–4.6)

2.7 (1.9–3.8)

0.9 (0.4–1.9)

  Upright position for birth

1.5 (0.8–3.1)

1.9 (1.4–2.7)

0.8 (0.4–1.7)