# Table 3 Binary logistic regression predicting any readmission (n = 7286)

B SE B Wald's X 2 EXP(B) (odds ratios) Lower 95% C.I. for EXP(B) Upper 95% C.I. for EXP(B) Sig
Diagnosis variables
Patient also had assault diagnosis at time of index episode (0 = no, 1 = yes) .197 .206 .915 1.217 .814 1.822
Patient also had other substance use diagnosis at time of index episode (0 = no, 1 = yes) .302 .145 4.315 1.352 1.017 1.798 *
Patient also had injury diagnosis at time of index episode (0 = no, 1 = yes) -.439 .157 7.857 .645 .475 .876 **
Patient also had other mental health diagnosis at time of index episode (0 = no, 1 = yes) .441 .155 8.070 1.555 1.147 2.108 **
Patient also had self-harm diagnosis at time of index episode (0 = no, 1 = yes) .316 .121 6.817 1.371 1.082 1.738 **
Patient also had “undetermined intent” diagnosis at time of index episode (0 = no, 1 = yes) -.030 .435 .005 .971 .413 2.279
Patient’s primary diagnosis at index admission was alcohol related (0 = no, 1 = yes) -.489 .124 15.479 .613 .481 .782 ***
Demographic variables
Average level of wealth of the patient’s area of residence at time of index admission -.081 .016 25.513 .923 .894 .952 ***
Age at start of index admission (within the 12-18 year age band) -.022 .027 .613 .979 .927 1.033
Patient was treated during index admission in an urban PCT (0 = no, 1 = yes) -.079 .089 .798 .924 .776 1.099
Patient was male (0 = no, 1 = yes) -.250 .088 8.160 .779 .656 .925 **
Address missing at time of index admission (0 = not missing, 1 = missing) .376 .317 1.409 1.456 .783 2.710
Length of stay in hospital during the index admission .005 .022 .055 1.005 .962 1.050
Patient had index admission on a “traditional” drinking day (0 = no, 1 = yes) -.154 .087 3.109 .857 .722 1.017
Outside ambient air temperature on date of index admission .003 .008 .120 1.003 .988 1.018
Constant -1.190 .479 6.178 .304    *
Tests
Omnibus Tests of Model Coefficients
Step    X 2 = 164.975,df = 15, p < .001
Block    X 2 = 164.975,df = 15, p < .001
Model   X 2 = 164.975,df = 15, p < .001
Hosmer and Lemeshow Test    X 2 = 17.311,df = 8, p = .027
-2 Log likelihood 4331.445
Cox & Snell R Square .023
Nagelkerke R Square .049
1. * p < .05, ** p < .01, *** p < =.001