Table 2. Unadjusted and adjusted Incidence Rate Ratios (95% CI) for drug use Read codes by age-band, deprivation, and time period (1994–2012).

Demographics	Unadjusted IRR (95% CI)		*Adjusted IRR (95% CI)
	Males	Females	Males	Females
Age-band
16–24	6.87 (6.58–7.17)	3.97 (3.77–4.19)	6.68 (6.39–6.99)	3.35 (3.17–3.55)
25–34	6.60 (6.32–6.89)	3.47 (3.28–3.66)	4.98 (4.76–5.21)	2.09 (1.98–2.22)
35–44	3.21 (3.06–3.36)	2.09 (1.97–2.12)	2.29 (2.18–2.41)	1.36 (1.28–1.44)
45–64	1	1	1	1
Townsend Score
1 (least deprived)	1	1	1	1
2	1.45 (1.37–1.53)	1.36 (1.26–1.47)	1.43 (1.36–1.51)	1.32 (1.22–1.43)
3	2.20 (2.10–2.31)	2.07 (1.93–2.22)	2.05 (1.95–2.16)	1.88 (1.75–2.02)
4	3.37 (3.22–3.54)	3.10 (2.89–3.31)	2.76 (2.63–2.89)	2.48 (2.32–2.66)
5(most deprived)	5.61 (5.36–5.88)	5.08 (4.76–5.42)	4.17 (3.98–4.37)	3.69 (3.46–3.95)
Time periods
1994–2000	2.30 (2.21–2.39)	2.32 (2.20–2.45)	2.29 (2.21–2.39)	2.28 (2.16–2.41)
2001–2006	1.75 (1.70–1.80)	1.69 (1.63–1.77)	1.74 (1.69–1.79)	1.71 (1.64–1.78)
2006–2012	1	1	1	1

*Adjusted for age deprivation, and time periods