Table 1.
Demographic comparison of patients with higher versus lower likelihood of missing baseline serum creatinine data among those with known baseline creatinine data, as indicated by propensity score analysis
| Baseline Characteristics | Higher Likelihood of Missing Baseline SCr (n=6502) | Lower Likelihood of Missing Baseline SCr (n=6501) | Total (n=13,003) |
|---|---|---|---|
| Median age (yr) | 54 (40–67) | 62 (53–71) | 59 (46–69) |
| Men, n (%) | 3250 (50) | 2858 (44) | 6108 (47) |
| Ethnicity, n (%) | |||
| White | 5388 (83) | 5417 (83) | 10,805 (83) |
| African-American | 798 (12) | 950 (15) | 1,748 (13) |
| Other | 316 (5) | 134 (2) | 450 (4) |
| Diabetes mellitus, n (%) | 536 (8) | 2334 (36) | 2870 (22) |
| Hypertension, n (%) | 1133 (17) | 4721 (73) | 5854 (45) |
| Coronary artery disease, n (%) | 1070 (16) | 2042 (31) | 3112 (24) |
| Chronic heart failure, n (%) | 403 (6) | 1609 (25) | 2012 (15) |
| Cerebrovascular disease, n (%) | 587 (9) | 1458 (22) | 2045 (16) |
| Peripheral vascular disease, n (%) | 162 (2) | 887 (14) | 1049 (8) |
| Chronic liver disease, n (%) | 117 (2) | 727 (11) | 844 (6) |
| Charlson comorbidity index | 0 (0–2) | 6 (2–12) | 2 (0–6) |
| Admission service, n (%) | |||
| Medical | 3339 (51) | 4319 (66) | 7658 (59) |
| Surgical | 2853 (44) | 1924 (30) | 4777 (37) |
| Other/mixed | 310 (5) | 258 (4) | 568 (4) |
| Home distance from hospital (miles) | 40 (15–100) | 25 (10–70) | 35 (10–80) |
| Length of hospital stay (d)a | 3.3 (2.1–6.0) | 3.2 (2.1–5.3) | 3.3 (2.1–5.7) |
| Baseline creatinine (mg/dl) | 0.90 (0.76–1.10) | 1.00 (0.80–1.30) | 0.95 (0.80–1.20) |
| Baseline eGFR (ml/min per 1.73 m2) | 83 (67–102) | 70 (52–89) | 77 (59–95) |
| AKI (%) | 958 (15) | 1582 (24) | 2540 (20) |
| Died within 60 d (%) | 259 (4) | 658 (10.0) | 917 (7) |
All values are expressed as n (%) or median (interquartile range). P<0.001 for differences between missing baseline and available baseline serum creatinine groups for all characteristics listed except as noted. SCr, serum creatinine; eGFR, estimated GFR.
a
P=0.05.