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Table 3 Logistic regression analysis of hair dye use pre-pregnancy, irregular menstruation, parity and birth weight

From: The effect of pre-pregnancy hair dye exposure on infant birth weight: a nested case-control study

 

LBW

Macrosomia

Unadjusted

OR (95% CI)

P

Adjusteda

P

Unadjusted

OR (95% CI)

P

Adjusted b

OR (95% CI)

P

OR (95% CI)

Hair dye use pre-pregnancy

1.67 (1.01, 2.76)

0.048

1.71(1.01, 2.92)

0.048

0.74 (0.48, 1.15)

0.180

0.75 (0.46, 1.23)

0.259

Irregular menstruation

2.84 (1.59, 5.08)

<  0.001

2.79 (1.53, 5.09)

0.001

1.97 (1.18, 3.29)

<  0.001

1.93 (1.09, 3.44)

0.023

Parity history

 First

1.43 (0.88, 2.33)

0.150

1.45 (0.83, 2.53)

0.189

0.59 (0.39, 0.91)

0.017

1.14 (0.67, 1.94)

0.643

  ≥ 2

1.00 (Reference)

 

1.00 (Reference)

 

1.00 (Reference)

 

1.00 (Reference)

 
  1. Abbreviations: LBW low birth weight, 95% CI confidence interval, OR odds ratio
  2. a, bLogistic regression models are adjusted for potential confounders (maternal age, maternal education level and pre-pregnant body mass index) as described in methods
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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