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Table 4 Crude and adjusted prevalence ratios (PR) with 95% confidence intervals analyses for low birthweight recurrence [LBWR]*

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

Variable Crude PRa[CI95%] Adjusted PRa[CI95%] p
Parity [previous births] (level 1)    0.01
 1 1.0 Reference   
 2 1.56 [0.95,2.55]   
 ≥3 1.93 [1.23,3.02]   
Economic status (level 2)    0.045
 A and B 0.15 [0.03,0.65] 0.89 [0.01,0.46]  
 C 0.34 [0.15,0.74] 0.25 [0.10,0.60]  
 D 0.69 [0.38,1.24] 0.60 [0.32,1.10]  
 E (poorest) 1.0 Reference 1.0 Reference  
Father’s schooling (years) (level 2)    0.13
 0 – 4 1.80 [1.02,3.19] 0.54 [0.25,1.15]  
 5 – 8 1.32 [0.76,2.28] 0.47 [0.22,1.00]  
 ≥ 9 1.0 Reference 1.0 Reference  
Preterm birth history (level 4)    <0.001
 No 1.0 Reference 1.0 Reference  
 Yes 3.55 [2.33,5.41] 4.01 [2.27,7.10]  
Newborn’s sex (level 4)    <0.001
 Male 1.0 Reference 1.0 Reference  
 Female 1.99 [1.31,3.02] 2.61 [1.45,4.69]  
Prenatal care (level 5)    0.003
 Adequate 1.0 Reference 1.0 Reference  
 Intermediate or Inadequate 2.09 [1.40,3.13] 2.57 [1.37,4.81]  
Miscarriage threat (level 6)    0.14
 No 1.01 [0.56,1.81] 2.00 [0.77,5.14]  
 Yes 1.0 Reference 1.0 Reference  
Gestational weight gain (kg) (level 6)    0.04
 < 7 1.0 Reference 1.0 Reference  
 7 – 9.9 1.47 [0.26,0.84] 0.59 [0.31,1.13]  
 ≥ 10 0.83 [0.02,0.26] 0.09 [0.01,0.77]  
  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: Prevalence Ratios; CI: Confidence Interval.