Table 3 Unit respiratory staffing and patient mortality.

	No of patients	% (n) dead	OR (95% CI) adjusting for relevant case mix and for unit clustering
Death <90 days of admission
Respiratory consultants per 1000 beds
0–2.7	2336	17.0 (396)	1.00
2.8–4.0	2585	15.5 (400)	0.93 (0.75 to 1.15)
>4.0	2353	13.4 (316)	0.75 (0.60 to 0.94)
No of respiratory juniors per 1000 beds
0–5.2	2393	16.5 (396)	1.00
5.3–9.1	2411	15.6 (376)	0.99 (0.79 to 1.23)
>9.1	2470	13.8 (340)	0.84 (0.67 to 1.04)
No of respiratory staff grades per 1000 beds
0–9	2303	16.4 (377)	1.00
10–13	2544	16.1 (410)	1.00 (0.81 to 1.25)
>13	2427	13.4 (325)	0.81 (0.64 to 1.01)
No of all respiratory staff per 1000 beds
0–15	2263	16.3 (368)	1.00
16–24	2539	16.1 (409)	0.99 (0.79 to 1.23)
>24	2472	13.6 (335)	0.84 (0.67 to 1.05)
Inpatient death
Respiratory consultants per 1000 beds
0–2.7	2360	8.3 (196)	1.00
2.8–4.0	2593	7.9 (205)	1.00 (0.76 to 1.32)
>4.0	2360	6.0 (141)	0.67 (0.50 to 0.90)
No of respiratory juniors per 1000 beds
0–5.2	2415	8.3 (200)	1.00
5.3–9.1	2415	8.0 (193)	1.03 (0.78 to 1.37)
>9.1	2483	6.0 (149)	0.69 (0.51 to 0.92)
No of respiratory staff grades per 1000 beds
0–9	2327	7.9 (184)	1.00
10–13	2547	8.8 (224)	1.20 (0.92 to 1.58)
>13	2439	5.5 (134)	0.66 (0.49 to 0.89)
No of all respiratory staff per 1000 beds
0–15	2289	7.9 (181)	1.00
16–24	2540	8.8 (223)	1.16 (0.88 to 1.53)
>24	2484	5.6 (138)	0.70 (0.52 to 0.95)