Obstetrics and Gynecology International

Research Article

Comparison of Perinatal Outcome of Preterm Births Starting in Primary Care versus Secondary Care in Netherlands: A Retrospective Analysis of Nationwide Collected Data

Table 5

Unadjusted and adjusted^* odds ratios (OR) for 5-minute Apgar score ≤4 and perinatal mortality (GA 34⁺⁰–36⁺⁶).


Characteristics	Apgar score ≤4 after 5 minutes			Mortality intrapartum and ≤7 dgn postpartum
GA 34⁺⁰–36⁺⁶ 41440	(%)	Unadjusted OR	Adjusted OR	(%)	Unadjusted OR	Adjusted OR
GA 34⁺⁰–36⁺⁶ 41440	(%)	(95% CI)	(95% CI)	(%)	(95% CI)	(95% CI)

Parturition	243 (0.59)			123 (0.30)
Onset and delivery in primary care	35 (0.08)	1.54 (1.06–2.22)	1.75 (1.20–2.55)	18 (0.04)	1.40 (0.84–2.33)	1.61 (0.96–2.21)
Onset primary and delivery in secondary care	61 (0.15)	0.60 (0.44–0.81)	0.72 (0.53–0.98)	22 (0.05)	0.38 (0.24–0.61)	0.49 (0.30–0.79)
Onset and delivery in secondary care	147 (0.35)	Reference	Reference	83 (0.2)	Reference	Reference
Maternal age
<25 years		0.98 (0.63–1.51)	0.92 (0.59–1.44)		1.11 (0.62–1.99)	1.14 (0.63–2.06)
25–29 years		Reference	Reference		Reference	Reference
30–34 years		1.24 (0.91–1.69)	1.9 (0.86–1.61)		1.18 (0.76–1.48)	1.05 (0.67–1.63)
≥35 years		1.37 (0.94–1.98)	1.13 (0.77–1.67)		1.27 (0.75–2.15)	0.88 (0.51–1.53)
Parity
0		0.72 (0.54–0.96)	0.78 (0.58–1.05)		0.78 (0.51–1.20)	0.82 (0.53–1.27)
1		Reference	Reference		Reference	Reference
2+		1.39 (0.97–2.00)	1.30 (0.90–1.90)		2.13 (1.32–3.44)	2.14 (1.31–3.51)
Ethnicity
European white		Reference	Reference		Reference	Reference
Non-European white		1.21 (0.88–1.68)	1.03 (0.73–1.47)		0.97 (0.60–1.59)	0.72 (0.43–1.21)
Socioeconomic status
High		Reference	Reference		Reference	Reference
Medium		1.24 (0.88–1.75)	1.24 (0.88–1.75)		1.15 (0.72–1.85)	1.10 (0.68–1.77)
Low		1.47 (1.02–2.13)	1.39 (0.94–2.04)		1.40 (0.84–2.33)	1.22 (0.72–2.08)
Fetal sex
Female		Reference	Reference		Reference	Reference
Male		0.91 (0.77–1.17)	0.89 (0.69–1.15)		0.89 (0.62–1.26)	0.86 (0.60–1.22)
Gestational age
34⁰–34⁶		1.87 (1.35–2.57)	2.14 (1.55–2.96)		2.00 (1.27–3.17)	2.38 (1.491–3.78)
35⁰–35⁶		1.51 (1.13–2.02)	1.68 (1.25–2.25)		1.82 (1.21–2.73)	2.06 (1.37–3.11)
36⁰–36⁶		Reference	Reference		Reference	Reference

Adjusted for onset and location of delivery, maternal age, parity before study delivery, ethnicity, socioeconomic status, fetal sex, and gestational age.