Table 5

Logistic regression analysis to generate odds ratios for being prescribed four or more root drugs during an 18-month period using data from normal and obese patients (combined) adjusted for all other factors.

	Odds ratio (95% CI)	P-value
Age (years)
<35	1.0 (reference)^a
35–44	1.05 (0.79 to 1.40)	0.74
45–54	1.40 (1.05 to 1.84)	0.02
55–64	2.10 (1.53 to 2.82)	<0.001
65+	3.33 (2.41 to 4.62)	<0.001

Sex
Male	1.0 (reference)^a
Female	1.99 (1.64 to 2.41)	<0.001

Deprivation category of practice address
Affluent	1.0 (reference)^a
Intermediate	1.57 (1.15 to 2.16)	<0.001
Deprived	1.90 (1.41 to 2.56)	<0.001

Country
England	1.0 (reference)^a
Scotland	1.26 (0.93 to 1.52)	0.07

Any comorbidity^b
No	1.0 (reference)^a
Yes	3.95 (3.25 to 4.79)	<0.001
Body mass index
18.5–25	1.0 (reference)^a
30.00–34.99	1.55 (1.26 to 1.90)	< 0.001
35.00–39.99	1.84 (1.35 to 2.51)	< 0.001
≥40.00	2.53 (1.66 to 3.84)	< 0.001

↵a Reference group <4 drugs.
↵b See Supplementary Appendix 2. CI = confidence interval.