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

Table 2 **Low birthweight recurrence [LBWR]* according to parity, maternal reproductive past history, maternal behaviors, and prenatal care in the index pregnancy**

Variable	N [%]	LBWR [%]	p
Parity [previous births] [n = 565]			<0.001 ^a
1	322 [57.0]	37 [11.5]
2	117 [20.7]	21 [17.9]
≥3	126 [22.3]	28 [22.2]
Smoking in the 3 ^rd trimester [n = 565]
No	382 [67.6]	47 [12.3]	<0.001 ^b
Yes	183 [32.4]	39 [21.3]
Coffee consumption in the 3 ^rd trimester [n = 565]			0.53 ^b
No	181 [32.0]	30 [16.6]
Yes	384 [68.0]	56 [14.6]
Abortion history [n = 565]			0.3 ^b
No	437 [77.3]	63 [14.4]
Yes	128 [22.7]	23 [18.0]
Interpartum interval [n = 544] ^c			0.28 ^b
< 24 months	117 [21.5]	21 [17.9]
≥ 24 months	427 [78.5]	60 [14.0]
Preterm birth in previous pregnancy [n = 532] ^c			<0.001 ^b
No	345 [64.8]	28 [8.1]
Yes	187 [35.2]	54 [28.9]
Prenatal care [n = 565]			<0.001 ^b
Adequate	320 [56.6]	33 [10.3]
Intermediate or Inadequate	245 [43.4]	53 [21.6]

* 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: linear trend; b: chi squared test for heterogeneity; c: indicates missing values.

ISSN: 1471-2393