Table 1 Participant characteristics of women diagnosed with breast cancer in the Nurse’ Health Studies who contributed to tumor data (N = 874)
From: Low dose environmental radon exposure and breast tumor gene expression
Cumulative average annual radon concentration | ||
|---|---|---|
Variable | High (≥2 pCi/L) | Low (<2 pCi/L) |
N = 184 | N = 690 | |
Age at diagnosis (year) [mean (SD)] | 57.6 (11.5) | 59.7 (11.3) |
Year of diagnosis [median (IQR)] | 2000 (8) | 1999 (8) |
Cohort [n (%)] | ||
 NHS | 100 (54%) | 431 (62%) |
 NHSII | 84 (46%) | 259 (38%) |
Menopausal status / menopausal hormone therapya [n (%)] | ||
 Postmenopausal not using | 56 (30%) | 213 (31%) |
 Postmenopausal using | 59 (32%) | 256 (37%) |
 Premenopausal/unknown | 69 (38%) | 221 (32%) |
 BMIa (kg/m2) [mean (SD)] | 26.3 (4.9) | 26.1 (5.1) |
Pack-year smokedb [n (%)] | ||
 0 (never smoker) | 111 (60%) | 357 (52%) |
  ≤ 16 pack-year | 18 (10%) | 71 (10%) |
  > 16 pack-year | 53 (29%) | 258 (37%) |
 Census track median income ($) ([mean (SD)] | 59,950 (18,200) | 64,480 (25,064) |
Region [n (%)] | ||
 Northeast | 52 (28%) | 233 (34%) |
 Midwest | 102 (55%) | 113 (16%) |
 West | 12 (7%) | 150 (22%) |
 South | 18 (10%) | 194 (28%) |