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

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

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    0.01b
 No 332 [59.2] 40 [12.0]  
 Yes 229 [40.8] 45 [19.6]  
Gestational weight gain [n = 403] a    <0.001c
 < 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    0.001b
 Male 286 [50.8] 29 [10.1]  
 Female 277 [49.2] 56 [22.2]  
  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: indicates missing values; b: chi squared test for heterogeneity; c: linear trend.