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

Table 2

Baseline characteristics and outcome of 52,397 women with preterm delivery (GA 25⁺⁰–36⁺⁶).

Population 1999–2007	Total	Onset and delivery	Onset in prim. care	Onset and delivery
	/%	Primary care	Delivery in sec. care	Secondary care
Total GA 25^0–36^6	52397 (100)	4134 (7.9)	17987 (34.3)	30279 (57.8)
minus exclusions (%)
Maternal age
<25 years, (%)	7573 (14.5)	603 (14.6)	2858 (15.9)	4112 (13.6)
25–29 years, (%)	16662 (31.8)	1311 (31.7)	6499 (36.1)	8852 (29.2)
30–34 years, (%)	19432 (37.1)	1568 (37.9)	6521 (36.3)	11343 (37.5)
≥35 years, (%)	8730 (16.7)	652 (15.8)	2109 (11.7)	5969 (19.7)
Parity
0, (%)	31115 (59.4)	2365 (57.2)	12386 (68.9)	16364 (54.1)
1, (%)	14407 (27.5)	1193 (28.9)	4047 (22.5)	9167 (30.3)
2+, (%)	6875 (13.1)	576 (13.9)	1554 (8.6)	4745 (15.7)
Ethnicity
European white, (%)	43898 (83.8)	3377 (81.7)	15381 (85.5)	25140 (83.0)
Socioeconomic status
High, (%)	11976 (22.9)	929 (22.5)	4119 (22.9)	6928 (22.9)
Medium, (%)	26080 (49.8)	2099 (50.8)	9184 (51.0)	14797 (48.9)
Low, (%)	14341 (27.4)	1106 (26.8)	4784 (26.0)	8551 (28.2)
Deprived neighborhood
Yes, (%)	3730 (7.1)	276 (6.7)	1129 (6.3)	2325 (7.9)
Fetal sex
Male fetal sex, (%)	29686 (56.7)	2337 (56.5)	10295 (57.2)	17054 (56.7)
Apgar score ≤4 after 5 min
Apgar ≤4, (%)	805 (1.5)	94 (2.3)	158 (0.9)	553 (1.8)
Perinatal death
Perinatal death, (%)	575 (1.10)	58 (1.4)	99 (0.6)	418 (1.4)