Table 4.

Multivariable model predicting false positives

Population characteristic	Level	OR (95% CI) N=32 195
Age (years)	1-year increase	1.01 (1.01 to 1.01)
Gender	Female	1.05 (1.01 to 1.10
Comorbidity	Cardiovascular disease	1.04 (0.86 to 1.26)
	Chronic respiratory disease	1.31 (1.22 to 1.40)
	Diabetes	0.84 (0.77 to 0.93)
	Hypertension	0.97 (0.90 to 1.05)
	Immunosuppression (including steroid use)	1.49 (1.36 to 1.64)
	Active malignancy	1.25 (0.97 to 1.61)
	Renal impairment	1.52 (1.17 to 1.97)
	Smoker	1.10 (1.04 to 1.16)
	Stroke	1.23 (0.87 to 1.75)
Number of drugs used	0	Reference
	1–5	1.13 (1.06 to 1.21)
	6–10	1.60 (1.42 to 1.81)
	11 or more	2.36 (1.82 to 3.07)
Deprivation index	1–2	Reference
	3–4	0.95 (0.89 to 1.02)
	5–6	0.95 (0.89 to 1.03)
	7–8	0.99 (0.92 to 1.07)
	9–10	1.05 (0.97 to 1.14)
Number of 111 contacts in study period	1	Reference
	2	0.86 (0.78 to 0.95)
	3 or more	0.71 (0.58 to 0.88)