Table 2.

Median AK Level by Perinatal Covariate

	N	AK Level pg/ml Median [IQR]	P value
Small for Gestational Age
No	32	3193 [1703, 3963]	<0.01
Yes	22	1200 [859, 2082]
Male Sex
No	27	1640 [1050, 3390]	NS
Yes	27	2370 [1250, 3810]
Preeclampsia
No	33	2475 [1373, 4210]	NS
Yes	21	1345 [963, 3022]
Chronic Hypertension
No	47	2305 [1230, 3530]	NS
Yes	7	1345 [750, 2370]
Preterm Labor
No	30	1310 [1006, 2509]	<0.05
Yes	24	3193 [1868, 4310]
C-section
No	33	2654 [1567, 3816]	<0.05
Yes	21	1250 [963, 2973]
Premature Rupture of Membranes			NS
No	35	1610 [1050, 3390]
Yes	19	3065 [1640, 4410]
Prolonged Rupture of Membranes			NS
No	48	2075 [1159, 2075]
Yes	6	3392 [1535, 4592]

P-values computed using Kruskal-Wallis non-parametric testing