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Table 2 Adjusted 'ratio of ratios' for all outcome measures, comparing practices across groups and between pre-intervention and intervention years

From: Impact of case management by advanced practice nurses in primary care on unplanned hospital admissions: a controlled intervention study

        With adjustment for overdispersion
Group Quantity Intervention practices Non-intervention practices Crude relative risk Point estimate 95% credible limits P-value
   2004–5 2005–6 2004–5 2005–6    Lower Upper  
Population (50 years and older) n 13556 13619 72492 72675      
Admissions a 1496 1401 8025 8246      
Ever admitted e 1095 1034 5954 5998      
Re-admitted r 255 226 1365 1421      
Analysis           
Admissions/registered patient a/n 0.1104 0.1029 0.1107 0.1135 0.909 0.909 0.841 0.984 0.018
Proportion registered patients ever admitted in year e/n 0.0808 0.0759 0.0821 0.0825 0.935 0.935 0.855 1.022 0.138
Single admitters as proportion of all registered patients (e-r)/n 0.0620 0.0593 0.0633 0.0630 0.962 0.962 0.869 1.065 0.457
Re-admitters as a proportion of all registered patients r/n 0.0188 0.0166 0.0188 0.0196 0.850 0.850 0.700 1.030 0.097
Proportion admitted patients with multiple admissions r/e 0.233 0.219 0.229 0.237 0.908 0.908 0.765 1.078 0.265
Total admissions per re-admitter (a-e+r)/r 2.573 2.624 2.517 2.582 0.994 0.995 0.940 1.053 0.820
Re-admissions per re-admitter (a-e)/r 1.573 1.624 1.517 1.582 0.990 0.991 0.903 1.088  
3rd & higher order admissions per re-admitter (a-e-r)/r 0.573 0.624 0.517 0.582 0.968 0.971 0.753 1.251  
Re-admissions per admitter (a-e)/e 0.366 0.355 0.348 0.375 0.900 0.900 0.772 1.050 0.181
Re-admissions as a proportion of all admissions (a-e)/a 0.268 0.262 0.258 0.273 0.925 0.926 0.826 1.037