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Table 4 Associations between PM2.5 component clusters and TDLU count

From: Outdoor air pollution and terminal duct lobular involution of the normal breast

 

All women

Premenopausal

Postmenopausal

N

RRa,b (95% CI)

N

RRa,b (95% CI)

N

RRa,b (95% CI)

Cluster

 1

31

Ref.

18

Ref.

13

Ref.

 2

1058

1.82 (1.13, 2.93)

750

1.64 (0.96, 2.80)

302

3.30 (1.17, 9.28)

 3

815

1.74 (1.08, 2.80)

554

1.56 (0.91, 2.68)

259

3.33 (1.19, 9.35)

  1. aAdjusted for age, smoking status, education, race/ethnicity, BMI, and percent of fat on the slide
  2. bFrom a zero-inflated negative binomial regression model. Zero model based on same covariates as main model