Table 3.
Duration of Acute care hospital stay compared to risk of 30-day and 90-day hospital readmission in AD and non-AD cohorts
| < 4 days (Ref.) |
4–7 days | 8–14 days | ≥ 15 days | |||
|---|---|---|---|---|---|---|
| 30-day Readmission | ||||||
| AD Cohort | n Readmitted/ n (%) | 672/6266 (10.7) | 399/3233 (12.3) | 153/1814 (8.4) | 79/877 (9.0) | 41/342 (12.0) |
| RR (95% CI) Unadjusted | 1.00 | 0.65 (0.54–0.80) | 0.70 (0.55–0.91) | 0.97 (0.69–1.36) | ||
| RR (95% CI) a | 1.00 | 0.68 (0.55–0.83) | 0.72 (0.55–0.93) | 0.95 (0.67–1.34) | ||
| RR (95% CI) b | 1.00 | 0.67 (0.54–0.82) | 0.72 (0.55–0.94) | 0.89 (0.63–1.30) | ||
| Non-AD Cohort | n Readmitted/ n (%) | 836/6266 (13.3) | 463/3023 (15.3) | 233/1955 (11.9) | 103/968 (10.6) | 37/320 (11.6) |
| RR (95% CI) Unadjusted | 1.00 | 0.75 (0.63–0.89) | 0.66 (0.52–0.83) | 0.72 (0.51–1.03) | ||
| RR (95% CI) a | 1.00 | 0.79 (0.67–0.94) | 0.69 (0.55–0.87) | 0.73 (0.51–1.05) | ||
| RR (95% CI) b | 1.00 | 0.82 (0.69–0.98) | 0.72 (0.57–0.91) | 0.72 (0.50–1.04) | ||
| 90-day Readmission | ||||||
| AD Cohort | n Readmitted/ n (%) | 1059/6266 (16.9) | 586/3233 (18.1) | 276/1814 (15.2) | 128/877 (14.6) | 69/342 (20.0) |
| RR (95% CI) Unadjusted | 1.00 | 0.81 (0.69–0.95) | 0.77 (0.63–0.95) | 1.14 (0.86–1.51) | ||
| RR (95% CI) a | 1.00 | 0.83 (0.71–0.98) | 0.79 (0.63–0.98) | 1.12 (0.85–1.49) | ||
| RR (95% CI) b | 1.00 | 0.83 (0.70–0.97) | 0.80 (0.64–0.99) | 1.11 (0.84–1.49) | ||
| Non-AD Cohort | n Readmitted/ n (%) | 1300/6266 (20.7) | 655/3023 (21.7) | 403/1955 (20.6) | 181/968 (18.7) | 61/320 (19.1) |
| RR (95% CI) Unadjusted | 1.00 | 0.94 (0.82–1.08) | 0.83 (0.70–0.99) | 0.85 (0.64–1.14) | ||
| RR (95% CI) a | 1.00 | 0.97 (0.84–1.12) | 0.85 (0.71–1.03) | 0.85 (0.63–1.14) | ||
| RR (95% CI) b | 1.00 | 0.99 (0.86–1.14) | 0.88 (0.73–1.07) | 0.87 (0.64–1.17) |
Abbreviations: AD Alzheimer’s disease; RR risk ratio; CI Confidence Interval; Ref. Reference
a adjusted for age, sex, hospital district, and year of hip fracture
b adjusted for age, sex, hospital district, year of hip fracture, diabetes, stroke, cardiovascular disease, mental disorders, highest occupational social class, duration of AD on hip fracture (in years), and required level of assistance at discharge