OBJECTIVE
To quantify the contribution of acute versus post-acute care factors to survival and functional outcomes after hip fracture.
DESIGN, SETTING, AND PARTICIPANTS
Retrospective cohort study using Medicare data; subjects included previously ambulatory nursing home residents hospitalized for hip fracture between 2005 and 2009.
METHODS
We used logistic regression to measure the associations of hospital and nursing home factors with functional and survival outcomes at 30 and 180 days among patients discharged to a nursing facility; we quantified the contribution of hospital versus nursing home factors to outcomes via the omega statistic.
RESULTS
Among 45,996 hospitalized patients, 1,814 (3.9%) died during hospitalization. 42,781 (93%) were discharged alive to a nursing home. Of these, 12,126 (28%) died within 180 days and 20,479 (48%) died or were newly unable to walk within 180 days. Hospital characteristics were not consistently associated with outcomes. Multiple nursing home characteristics predicted 30- and 180-day outcomes, including bed count, chain membership, and performance on selected quality measures. Nursing home factors explained three times more variation in the odds of 30-day mortality than did hospital factors (omega, hospital versus nursing home: 0.32, 95% confidence interval (CI) 0.11, 0.96), seven times more variation in the odds of 180-day mortality (omega: 0.15, 95% CI 0.04, 0.61), and eight times more variation in the odds of 180-day death or new dependence in locomotion (omega: 0.12, 95% CI 0.05, 0.31).
CONCLUSIONS
Nursing home factor sex plain a larger proportion of the variation in clinical outcomes following hip fracture than do hospital factors.