Table 4

Two-part model estimates for mental health inpatient admission

	Probability of admission in 6 months				Cost of admission over 6 months
	N=5624				N=195
		95% CI				95% CI
Regressors	OR	Lower bound	Upper bound	p Value	Exp (b)	Lower bound	Upper bound	p Value
MMSE	0.94	0.86	1.02	0.14	1.01	0.96	1.06	0.84
MMSE (squared)	1.00	1.00	1.00	0.77	1.00	1.00	1.00	0.35
Year (Ref: 2006 or earlier)
2007	0.86	0.55	1.36	0.52	1.08	0.83	1.40	0.56
2008	0.90	0.58	1.39	0.62	1.24	0.96	1.61	0.11
2009	0.50	0.31	0.83	<0.01	1.35	1.00	1.81	0.05
2010 or later	0.36	0.22	0.58	<0.01	1.35	1.02	1.78	0.04
Prior 12m General hospital inpatient care (Ref: No history)	2.40	1.75	3.29	<0.01	1.12	0.94	1.33	0.22
Prior 12m Mental health inpatient care (Ref: No history)	7.73	4.47	13.34	<0.01	1.75	1.37	2.22	<0.01
Age	0.96	0.94	0.98	<0.01	1.00	0.99	1.01	0.86
Gender (0=female; 1=male)	1.16	0.83	1.63	0.39	1.13	0.92	1.38	0.23
Ethnicity (Ref: White)
Caribbean/African	0.89	0.54	1.47	0.64	0.97	0.73	1.29	0.84
East/South Asian	1.21	0.53	2.75	0.66	1.42	1.04	1.95	0.03
Mixed/unknown	0.86	0.36	2.09	0.75	1.24	0.72	2.11	0.44
Partner (Ref: No partner)	1.63	1.11	2.39	0.01	0.81	0.66	1.01	0.06
Living alone (Ref: Not)	2.56	1.76	3.71	<0.01	1.08	0.89	1.32	0.44
Living conditions (HoNOS11)
Minor problems only	1.90	1.28	2.81	<0.01	0.87	0.71	1.08	0.22
Significant problems	2.06	1.32	3.21	<0.01	1.23	0.96	1.59	0.10
ADL (HoNOS10)
Minor problems only	1.23	0.69	2.19	0.49	1.12	0.77	1.62	0.55
Significant problems	0.97	0.56	1.67	0.91	1.15	0.79	1.70	0.46
Physical illness (HoNOS5)
Minor problems only	1.76	1.13	2.73	0.01	0.94	0.71	1.25	0.68
Significant problems	1.70	1.10	2.64	0.02	1.13	0.85	1.49	0.40
Agitated (HoNOS1)
Minor problems only	1.86	1.23	2.82	<0.01	0.70	0.54	0.91	0.01
Significant problems	3.59	2.36	5.45	<0.01	1.04	0.81	1.32	0.77
Depression (HoNOS7)
Minor problems only	0.92	0.63	1.33	0.65	1.20	0.96	1.50	0.11
Significant problems	2.04	1.35	3.09	<0.01	1.25	1.00	1.56	0.05
Relationship (HoNOS9)
Minor problems only	1.20	0.80	1.80	0.38	1.06	0.85	1.33	0.57
Significant problems	1.71	1.13	2.60	0.01	0.92	0.73	1.16	0.51
Constant term	0.42	0.07	2.67	0.36	17 397	52.66	57 476	<0.01

Reference group for all HoNOS variables: no problem. Exp(b) estimate is a ratio of expected cost, which can be interpreted as the percentage change in estimated costs (=100×[exp(b)−1]) for each unit change in an independent variable.
HoNOS, Health of the Nation Outcome Scale; MMSE, Mini-Mental State Examination.