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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