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Table 4 Adjusted effects of immune markers in maternal serum and in whey on AS at ages 6 and 12 months

From: Maternal immune markers in serum during gestation and in breast milk and the risk of asthma-like symptoms at ages 6 and 12 months: a longitudinal study

Immune markers

Immune markers in maternal serum before delivery

Immune markers in breast milk whey

RR*

p-value

RR*

p-value

Type-1/pro-inflammatory cytokines/chemokine (pg/mL)

CXCL10

4th quartile (high)

2.30

0.01

1.31

0.46

3rd quartile

1.57

0.13

0.43

0.03

2nd quartile

0.96

0.90

0.68

0.28

Type-2/pro-allergic cytokines/chemokines (pg/mL)

IL-13

4th quartile (high)

3.02

0.004

4.18

0.001

3rd quartile

2.20

0.03

1.12

0.13

2nd quartile

1.10

0.78

1.91

0.83

IL-5

4th quartile (high)

4.34

0.001

2.24

0.01

3rd quartile

1.85

0.18

n/a

n/a

2nd quartile

2.27

0.05

n/a

n/a

T-regulatory/anti-inflammatory cytokine (pg/mL)

TGF-β1

    

4th quartile (high)

0.53

0.11

0.31

0.01

3rd quartile

0.64

0.31

0.26

0.002

2nd quartile

0.39

0.08

1.13

0.75

# Immunoglobulin A (mg/mL)

4th quartile (high)

2.09

0.04

0.23

0.02

3rd quartile

n/a

n/a

0.54

0.14

2nd quartile

n/a

n/a

1.09

0.83

  1. * Immune markers (except for IL-5 in whey and IgA in serum) were categorized into quartiles using the first quartile (lowest values) as reference. IL-5 in whey and IgA in serum were dichotomized. IL-5, IL-13, CXCL10, IgA, and TGF-β1 serum and whey were adjusted for child’s sex, maternal age during pregnancy, maternal race, smoking during pregnancy, vaginal infections during pregnancy, maternal history of asthma, eczema, and rhinitis, consumption of antibiotics during pregnancy, season of child’s birth, any respiratory infection during infancy, and household cigarette use at ages 6 and 12 months.
  2. # Secretory immunoglobulin A in whey but not in serum.
  3. Gestational age, maternal education, pet exposure, and mode of delivery were removed from the models because they were not confounding.
  4. The overall effect of the quartiles was statistically significant after applying a false discovery rate (adjusted p value < 0.05).