Table 4

Association between ward level staffing and standardised mortality: 31 trusts

	Unadjusted				Adjusted
	Risk ratio	L_{95% CL}	U_{95% CL}	p Value	Risk ratio	L_{95% CL}	U_{95% CL}	p Value
Medical
Non-teaching trust					1.12	1.08	1.15	<0.01
Beds (thousands)					1.08	1.04	1.13	<0.01
Patients per RN (χ², df, p value)	(59.831, 3df, <0.001)				(12.524, 3df, <0.001)
≤6	0.80	0.76	0.85	<0.001	0.89	0.83	0.95	0.001
6.01–8.00	0.92	0.87	0.96	<0.001	0.96	0.91	1.01	0.14
8.01–10.00	0.91	0.87	0.96	<0.001	0.96	0.91	1.01	0.11
≥10	1.00				1.00
Patients per HCSW	1.01	1.00	1.02	0.001	1.00	0.99	1.01	0.92
Occupied beds per FTE Doctor	1.24	1.19	1.28	<0.001	1.12	1.06	1.17	<0.001
Surgical
Non-teaching trust					1.09	1.03	1.17	<0.01
Beds (thousands)					1.15	1.07	1.24	<0.01
Patients per RN (χ², df, p value)	(11.604, 3df, 0.009)				(3.290, 3df, 0.349)
≤6	0.83	0.69	1.00	0.049	0.89	0.73	1.08	0.23
6.01–8.00	0.90	0.75	1.08	0.26	0.90	0.75	1.09	0.30
8.01–10.00	0.90	0.75	1.08	0.26	0.87	0.73	1.05	0.16
≥10	1.00				1.00
Patients per HCSW	1.02	1.01	1.03	0.002	1.01	1.00	1.03	0.053
Occupied beds per FTE Doctor	1.22	1.13	1.31	<0.001	1.15	1.03	1.28	0.010

HCSW, healthcare support worker; FTE, full-time equivalent; RN, registered nurse.