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

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

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]  
  1. * 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.
  2. a: linear trend; b: chi squared test for heterogeneity; c: indicates missing values.