Table 1.

Baseline characteristics of the breast cancer screening cohort (n=141,326)

Patient CharacteristicsCKD
CKD, n=121,135Stages 3a and 3b, n=15,383Stages 4 and 5, n=984Dialysis,an=3499Transplant, n=325
Age groups, yr
 50–5932,157 (26.5)84 (8.5)1059 (6.9)661 (18.9)122 (37.5)
 60–6959,698 (49.3)404 (41.1)6691 (43.5)1618 (46.2)156 (48.0)
 70–7429,280 (24.2)496 (50.4)7633 (49.6)1220 (34.9)47 (14.5)
Age, yrb64.4 (6.7)68.3 (5.0)68.0 (5.6)65.7 (6.3)62.1 (6.4)
Income quintile,c
 1 (Lowest)24,655 (20.4)270 (27.4)3310 (21.5)1038 (29.7)73 (22.5)
 226,890 (22.2)225 (22.9)3583 (23.3)834 (23.8)64 (19.7)
 325,083 (20.7)199 (20.2)3214 (20.9)653 (18.7)71 (21.8)
 422,928 (18.9)169 (17.2)2810 (18.3)536 (15.3)63 (19.4)
 5 (Highest)21,579 (17.8)121 (12.3)2466 (16.0)438 (12.5)54 (16.6)
Rural residential statusd10,022 (8.3)119 (12.1)1703 (11.1)483 (13.8)30 (9.2)
Comorbidities
 Charlson comorbidity indexe
  0–1113,794 (93.9)564 (57.3)12,857 (83.6)206 (5.9)33 (10.2)
  24610 (3.8)142 (14.4)1287 (8.4)659 (18.8)151 (46.5)
  ≥32731 (2.3)278 (28.3)1239 (8.1)2364 (67.6)141 (43.3)
 Diabetes37,503 (31.0)557 (56.6)6135 (39.9)2303 (65.8)117 (36.0)
 Hypertension79,053 (65.3)866 (88.0)12,897 (83.8)3178 (90.8)283 (87.1)
 Myocardial infarction1729 (1.4)83 (8.4)558 (3.6)505 (14.4)9 (2.8)
 Hemorrhagic stroke196 (0.2)<6 (0.6)40 (0.3)21 (0.6)<6 (1.8)
 Ischemic stroke787 (0.6)34 (3.5)271 (1.8)211 (6.08 (2.5)
 Dementia3079 (2.5)687 (4.5)60 (6.1)264 (7.5)8 (2.5)
 Depression11,670 (9.6)1608 (10.5)129 (13.1)496 (14.2)37 (11.4)
Health care utilization
 General practitioner visits in the previous 1 yr
  Mean (SD)9.07 (7.66)10.49 (9.06)12.85 (12.80)14.97 (18.06)5.92 (7.20)
  Median (IQR)7 (5–11)8 (5–13)10 (6–16)9 (4–19)4 (1–8)
 Long–term care status in previous 90 d1094 (0.9)201 (1.3)21 (2.1)174 (5.0)1 (0.3)
  • Values are n (%) unless otherwise noted. IQR, interquartile range.

  • a The mean (SD) dialysis vintage was 1.20 (2.01) years. The median (IQR) dialysis vintage was 0.3 (0.3–1.1) years.

  • b Values are mean (SD).

  • c Income quintile category 3 includes the missing values.

  • d Rural defined as population <10,000.

  • e Patients with no hospitalizations (i.e., missing Charlson score) were coded as zero.