Table 3:

Adjusted Length of Stay (Days) Stratified by Gestational Age and Birthweight

	FERTILE (F)	SUBFERTILE (S)	ART (A)	P-value S vs F	P-value A vs F	P-value A vs S	Overall P-value
Overall	4.19 (0.03)	4.20 (0.04)	4.17 (0.03)	0.69	0.46	0.42	0.69
Gestational Age
23–27 wks	97.38 (5.31)	99.64 (9.79)	96.14 (6.94)	0.78	0.81	0.70	0.93
28–33 wks	36.72 (1.16)	38.07 (2.07)	38.08 (1.66)	0.45	0.26	0.99	0.42
34–36 wks	7.38 (0.23)	7.04 (0.36)	7.38 (0.31)	0.27	0.98	0.36	0.54
37–38 wks	4.11 (0.05)	4.16 (0.08)	3.96 (0.07)	0.35	0.0023	0.0067	0.0057
≥39 wks	3.82 (0.03)	3.88 (0.04)	3.88 (0.04)	0.018	0.0048	0.93	0.0015
Birthweight
≤1000 g	94.53 (4.78)	99.80 (9.07)	95.89 (6.58)	0.49	0.79	0.66	0.77
1001–1500 g	49.95 (2.48)	61.47 (5.59)	49.21 (3.23)	0.011	0.75	0.015	0.029
1501–2500 g	8.78 (0.30)	8.60 (0.48)	8.25 (0.38)	0.65	0.072	0.45	0.19
≥2501 g	3.93 (0.02)	3.95 (0.04)	3.97 (0.03)	0.43	0.082	0.63	0.17

Least Square Mean (Standard Error) using Gamma Distribution, adjusted for maternal age, race, education, payer (self pay, private, public), pre-existing diabetes and hypertension, parity, gender, gestational age (continuous), birth year, method of delivery, mother’s prolonged stay, gestational diabetes and hypertension.