Table 2. Final multivariable analysis of variables independently associated with inpatient death, Cambridge, England, 2016/17 (n = 329)^a.

Variable	Category	OR (95% CI)	p value
Age	NA	1.06 per year (1.03–1.10)	< 0.001
Sex	Female	Reference	0.19
	Male	1.73 (0.76–1.94)
Place of acquisition	Community	Reference	0.16
	Hospital	1.82 (0.79–4.23)
Haemoglobin concentration g/L	NA	0.97 (0.95–1.00) per g/L	0.02
Excessive alcohol use	Yes	13.2 (1.93–90.5)	0.01
	No	Reference
Oseltamivir course completed	1.Not given	Reference	0.23
	2. Non-standard course	0.3 (0.06–1.54)
	3. Appropriately modified course	0.34 (0.09–1.28)
	4. Standard course	0.32 (0.11–0.93)
Receipt of 2016/17 seasonal influenza vaccine	Yes	0.63 (0.26–1.49)	0.3
	No	Reference

CI: confidence interval; NA: not applicable; OR: odds ratio.

^a Of 332 patients, 329 had serum haemoglobin concentration results.