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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.