Prognostic factors for low birthweight repetition in successive pregnancies: a cohort study

Table 3 **Low birthweight recurrence [LBWR]* according to pregnancy morbidities, preterm labor, gestational weight gain, and newborns’ sex**

Variable	N [%]	LBWR [%]	p
Arterial hypertension [n = 562] ^a			0.74 ^b
No	410 [72.9]	64 [15.6]
Yes	152 [27.1]	22 [14.5]
Anemia [n = 555] ^a			0.02 ^b
No	179 [32.5]	36 [20.1]
Yes	376 [67.7]	48 [12.8]
Miscarriage threat [n = 564] ^a			0.96 ^b
No	491 [87.1]	75 [15.3]
Yes	73 [12.9]	11 [15.1]
Preterm labor [n = 565]			0.01 ^b
No	422 [74.7]	55 [13.0]
Yes	143 [25.3]	31 [21.7]
Last trimester vaginal bleeding [n = 565]			0.82 ^b
No	516 [91.3]	78 [15.1]
Yes	49 [8.7]	8 [16.3]
Urinary tract infection [n = 561] ^a			0.01^b
No	332 [59.2]	40 [12.0]
Yes	229 [40.8]	45 [19.6]
Gestational weight gain [n = 403] ^a			<0.001^c
< 7 kg	236 [49.6]	60 [25.4]
7 – 9.9 kg	99 [20.8]	12 [12.1]
≥ 10 kg	141 [29.6]	3 [2.1]
Newborn’s sex [n = 563] ^a			0.001^b
Male	286 [50.8]	29 [10.1]
Female	277 [49.2]	56 [22.2]

* LBWR defined as birth weight < 2,500 g in the index pregnancy (pregnancy that ended in 2004) amongst women with at least one previous LBW newborn in the two immediate pregnancies before the pregnancy that ended in 2004.
a: indicates missing values; b: chi squared test for heterogeneity; c: linear trend.

ISSN: 1471-2393