Table 2.

Characteristics of index hospitalization, 30-day readmission, and unadjusted odds ratio for all-cause 30-day readmission

CharacteristicPatients, n (%)30-Day Readmission, n (%)Odds Ratio for 30-Day Readmission (95% CI)
Sex
 Male2723 (53.3)665 (24.4)Reference
 Female2389 (46.7)617 (25.8)1.07 (0.89 to 1.28)
Age
 <2 yr703 (13.8)231 (32.9)Reference
 ≥2 yra4409 (86.2)1051 (23.8)0.60 (0.50 to 0.80)
Race
 All Other3484 (68.2)853 (24.5)Reference
 Black1628 (31.8)429 (26.4)1.05 (0.85 to 1.29)
Underlying diagnosis
 Congenital, obstructive1319 (25.8)340 (25.8)Reference
Missinga1805 (35.3)418 (23.2)0.53(0.4 to 0.68)
 Glomerular1988 (38.9)524 (26.4)1.07 (0.86 to 1.33)
Dialysis modality
 PD2594 (50.8)626 (24.1)Reference
 HD2518 (49.2)656 (26.0)1.10 (0.92 to 1.31)
Principal diagnosis for admission
 Infection615(11.9)134(21.8)Reference
 Peritonitis and PD complication756(14.8)136(18.0)0.80 (0.59 to 1.09)
 HD access complication and infection526(10.3)101(19.2)0.80 (0.57 to 1.10)
 Cardiovascular823(16.1)166(20.2)0.90 (0.70 to 1.27)
 Electrolyte and fluid298(5.8)81(27.4)1.20 (0.86 to 1.80)
 Complication of transplant203 (4.0)39 (19.2)0.90 (0.56 to 1.40)
 Other1891 (37.2)625 (33.0)1.09 (0.87 to 1.80)
Length of stay
 1 d837 (16.4)209 (25.0)Reference
 2–6 d2570 (50.3)543 (21.1)0.99 (0.8 to 1.23)
 7–13 d814 (15.9)162 (19.9)0.89 (0.68 to 1.18)
 ≥14 da891 (17.4)368 (41.3)1.28 (1.0 to 1.73)
Total comorbid conditions
 01443 (28.2)265 (18.4)Reference
 1–21285 (25.1)450 (35.0)1.25 (0.86 to 1.8)
 ≥3a2384 (46.6)567 (23.8)1.44 (1.03 to 2.0)
Primary payer
 Commercial1048 (20.5)290 (27.7)Reference
 Medicare1742 (34.0)463 (26.6)1.00 (0.79 to 1.29)
 Medicaid1814 (35.5)455 (25.0)1.00 (0.79 to 1.27)
 Other/missinga508 (10.0)74 (14.6)0.64 (0.44 to 0.93)
Discharge season
 Summer1268 (24.8)320 (25.2)Reference
 Fall1286 (25.2)319 (24.8)0.92 (0.74 to 1.14)
 Winter1244 (24.3)312 (25.0)0.97 (0.78 to 1.20)
 Spring1314 (25.7)331 (25.2, o)0.97 (0.78 to 1.19)
Operating room charge
 No3674(71.9)1045(28.7)Reference
Yesa1438(28.1)237(16.5)0.72(0.60 to 0.87)
ICU charge
 No4263(83.4)1111(26.1)Reference
 Yes849(16.6)171(20.1)0.94 (0.77 to 1.16)
  • Odds ratios, and 95% confidence intervals (95% CIs) were calculated using mixed-effects logistic regression, clustering by patients within hospital to account for repeated admissions across multiple centers. PD, peritoneal dialysis; HD, hemodialysis; ICU, intensive care unit.

  • a P<0.05.