Table 1

Comparison of characteristics of mothers and children who were followed to those of mothers and children who were not (column per cents).

Maternal or infant characteristic		Followed	Not followed
Maternal education	<12	18	24
	12 (High school)	26	28
	>12 to <16	23	28
	College grad	18	14
	>16	14	6
Married	Yes	56	44
Public insurance	Yes	41	50
Delivery complication	Preterm labour	43	43
	pPROM	22	22
	Pre-eclampsia	15	11
	Abruption	11	10
	Cerv insufficiency	5	7
	Fetal indication	3	6
Sex	Male	53	55
Black race	Yes	27	27
Gestational age (weeks)	23–24	20	26
	25–26	47	46
	27	33	29
Birthweight Z-score^§	<−2	6	3
	≥−2, <−1	12	11
	>−1	82	86
Head circumference Z-score^§	<−2	8	5
	≥−2, <−1	23	20
	>−1	69	75
Lowest ¼ile MAP^*	Yes	22	15
Vasopressor^†	Yes	26	19
Labile MAP^‡	Yes	24	17
Max number of infants		945	175

↵* Lowest ¼ile MAP: lowest mean arterial pressure recorded in the first 24 h, in the lowest quartile for gestational age.
↵† Vasopressor: treatment for hypotension in the first 24 h, using any vasopressor (dopamine, dobutamine, epinephrine).
↵‡ Labile MAP: labile blood pressure, defined as the upper quartile of the difference in the lowest and highest mean arterial pressure.
↵§ Yudkin standard.24