Table 4

Results of adjusted regression models

 Relative difference Absolute difference P value Interaction testP value* Outcomes over the follow-up period Point estimate 95% CI Point estimate 95% CI Residential care homes Potentially avoidable admissions 0.50 (0.30 to 0.82) −0.20 (−0.28 to –0.07) 0.007 0.020 Emergency admissions 0.60 (0.42 to 0.86) −0.37 (−0.54 to –0.13) 0.004 0.005 A&E attendances 0.57 (0.40 to 0.81) −0.57 (−0.80 to –0.25) 0.001 0.008 Hospital bed days† 0.81 (0.43 to 1.53) −0.007 (−0.022 to 0.021) 0.467 Count: 0.858 Zero: 0.135 Outpatient attendances 1.28 (0.88 to 1.86) 0.41 (−0.18 to 1.26) 0.169 0.266 Deaths outside hospital 1.25 (0.54 to 2.92) 17.3% (−31.8% to 132.7%) 0.608 0.558 Nursing homes Potentially avoidable admissions 1.17 (0.76 to 1.81) 0.03 (−0.05 to 0.16) 0.484 Emergency admissions 1.15 (0.85 to 1.56) 0.08 (−0.08 to 0.30) 0.352 A&E attendances 1.04 (0.78 to 1.38) 0.03 (−0.15 to 0.26) 0.806 Hospital bed days 1.07 (0.64 to 1.80) 0.002 (−0.012 to 0.027) 0.790 Outpatient attendances 0.97 (0.71 to 1.32) −0.06 (−0.60 to 0.67) 0.840 Deaths outside hospital 1.00 (0.40 to 2.49) 0.00 (−53.1% to 131.9%) 0.992
• All relative differences are rate ratios, apart from deaths outside hospital and deaths, which are ORs. See online supplementary file 2 for a list of covariates each outcome was adjusted for and for model fit statistics. Absolute differences are calculated by first calculating the relative difference, then multiplying the relative difference with the crude rate in the matched control group, and then comparing the resulting rate to the crude rate.

• *Interaction test of residential versus nursing homes.

• †The absolute difference in hospital bed days shows the difference in the proportion of hospital bed days out of the period residents were followed up in the study. The interaction model estimating hospital bed days is a Hurdle model and produces separate effect estimates on whether a resident is hospitalised or not (‘Zero’ part) and on the number of hospital bed days following hospitalisation (‘Count’ part).

• A&E, Accident & Emergency.