Table 4.

Univariable and multivariable linear regression models on fetal weight and the predicted values of gestational age-adjusted fetal weight

	Fetal weight			Predicted fetal weight
	β	95% CI β	p	(gestational age-adjusted)
				β	95% CI β	P value
Univariable
Age (yr)	16	−11 to 43	0.25	18	−6 to 42	0.14
Primigravida	−504	−828 to −180	0.003	−379	−670 to −87	0.01
Lupus nephritis	−760	−1238 to −281	0.002	−619	−1047 to −191	0.01
Dialysis before gestation	60	−238 to 357	0.69	67	−197 to 331	0.62
Diuresis volume (per 100 ml increase)	12	−6 to 30	0.19	10	−6 to 26	0.23
Hypertension at baseline	−481	−829 to −132	0.01	−277	−593 to 40	0.09
Residual creatinine clearance (ml/min per 1.73 m2)a	8	−21 to 37	0.59	4	−22 to 30	0.78
Renal stdKt/Va	71	−133 to 275	0.49	36	−149 to 221	0.70
Hours/week	47	11 to 84	0.01	44	11 to 76	0.01
Peripartum creatinine (mg/dl)	−88	−181 to 4	0.06	−74	−157 to 8	0.08
Average BUN (mg/dl)	−36	−50 to −22	<0.0001	−22	−36 to −9	0.001
Average BUN ≥35 mg/dl	−671	−941 to −400	<0.0001	−425	−681 to −170	0.001
HD stdKt/V	154	−93 to 401	0.22	175	−43 to 393	0.11
Total stdKt/Va	171	−38 to 380	0.11	129	−61 to 320	0.18
Death or birth <30 wks of gestation	−1311	−1583 to −1039	<0.0001	−1323	−1526 to −1120	<0.0001
Preeclampsia	−987	−1364 to −609	<0.0001	−807	−1149 to −465	<0.0001
Polyhydramnios	711	453 to 970	<0.0001	573	337 to 809	<0.0001
Cesarean section	248	−88 to 584	0.15	396	106 to 687	0.008
Multivariable model 1
Lupus nephritis	−447	−933 to 40	0.07	−368	−814 to 78	0.10
Primigravida	−394	−717 to −72	0.02	−294	−589 to 2	0.05
Hypertension at baseline	−365	−699 to −30	0.03	−156	−463 to 150	0.31
Diuresis volume (per 100 ml increase)	17	−2 to 37	0.08	17	−0.4 to 35	0.06
HD stdKt/V	183	−79 to 446	0.17	241	−0.2 to 482	0.05
Multivariable model 2
Lupus nephritis	−437	−877 to 3	0.05	−394	−827 to 38	0.07
Primigravida	−351	−646 to −56	0.02	−263	−552 to 27	0.07
Hypertension at baseline	−222	−531 to 88	0.16	−104	−408 to 201	0.50
Diuresis volume (per 100 ml increase)	13	−3 to 28	0.10	10	−5 to 25	0.19
Average BUN (mg/dl)	−31	−44 to −17	<0.0001	−19	−33 to −6	0.01
Multivariable model 3
Preeclampsia	−654	−961 to −346	<0.0001	−570	−884 to −256	0.001
Polyhydramnios	291	45 to 536	0.02	249	−2 to 499	0.05
Primigravida	−255	−508 to −2	0.05	−169	−428 to 89	0.20
Lupus nephritis	−280	−654 to 94	0.14	−259	−641 to 124	0.18
Hypertension at baseline	−126	−384 to 133	0.34	−13	−278 to 251	0.92
Average BUN (mg/dl)	−23	−35 to −11	0.0002	−13	−25 to 0	0.04
Hours/week	37	5 to 68	0.02	38	5 to 70	0.02
Diuresis volume (per 100 ml increase)	21	7 to 35	0.005	18	3 to 33	0.02

BUN, blood urea nitrogen; CI, confidence interval; HD, hemodialysis; std, standard; Total stdKt/V, renal stdKt/V + HD stdKt/V.

^aVariables for 73 of the 93 patients (78.5%).