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

Table 4

Baseline characteristics and outcome of 41,440 women with late preterm delivery (GA 34⁺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 34^0–36^6	41440 (100)	3494 (8.4)	15507 (37.4)	22439 (54.2)
minus exclusions (%)
Maternal age
<25 years, (%)	5799 (14.0)	484 (13.9)	2393 (15.4)	2922 (13.0)
25–29 years, (%)	13278 (32.0)	1117 (32.0)	5629 (36.3)	6532 (32.0)
30–34 years, (%)	15496 (37.4)	1332 (38.1)	5654 (36.5)	8510 (37.9)
≥35 years, (%)	6867 (16.6)	561 (16.1)	1831 (11.8)	4475 (19.9)
Parity
0, (%)	24453 (59.0)	1936 (55.4)	10527 (67.9)	11990 (53.4)
1, (%)	11651 (28.1)	1065 (30.5)	3595 (23.2)	6991 (31.3)
2+, (%)	5336 (12.9)	493 (14.1)	1385 (8.9)	3458 (15.4)
Ethnicity
European white, (%)	34881 (84.2)	2871 (82.2)	13252 (85.5)	18758 (83.6)
Socioeconomic status
High, (%)	9572 (23.1)	784 (22.4)	3575 (23.05)	5213 (23.2)
Medium, (%)	20736 (50.0)	1789 (51.2)	7956 (51.3)	10991 (49.0)
Low, (%)	11132 (26.9)	921 (26.4)	3976 (25.6)	6235 (27.8)
Deprived neighborhood
Yes, (%)	2853 (6.9)	225 (6.4)	968 (6.2)	1660 (7.4)
Fetal sex
Male fetal sex, (%)	23143 (55.9)	1965 (56.3)	8807 (56.8)	12371 (55.1)
Apgar score ≤4 after 5 min
Apgar ≤4, (%)	243 (0.6)	35 (1.0)	61 (0.4)	147 (0.7)
Perinatal death
Perinatal death, (%)	123 (0.3)	18 (0.5)	22 (0.1)	83 (0.4)