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) | |
PM2.5 total mass (μg/m3) | ||||||
 Quartile 1 | 477 | Ref. | 333 | Ref. | 143 | Ref. |
 Quartile 2 | 464 | 1.17 (1.00, 1.38) | 333 | 1.21 (1.00, 1.45) | 126 | 1.02 (0.72, 1.42) |
 Quartile 3 | 529 | 1.16 (0.99, 1.37) | 337 | 1.21 (1.00, 1.47) | 190 | 1.06 (0.78, 1.44) |
 Quartile 4 | 434 | 1.08 (0.92, 1.28) | 319 | 1.04 (0.86, 1.26) | 115 | 1.28 (0.92, 1.78) |
 IQR increasec | 1,904 | 1.06 (1.01, 1.11) | 1,322 | 1.05 (1.00, 1.11) | 574 | 1.11 (1.00, 1.23) |