Table 2.

Description of opioid user cohort: age, gender, and mortality.

Number of individuals	198,247
Person-years under observation	541,891
Median age at cohort accession date, years [IQR]	32.1 [26.4, 38.7]
Gender (%)
Male	142,608 (72)
Female	55,639 (28)
Age group at cohort entry (%)
18–24	37,172 (19)
25–34	85,725 (43)
35–44	55,005 (28)
45–64	20,345 (10)
All-cause mortality
Number of deaths	3,974
Rate per 10,000 pys [95%  CI]	73 [71,76]
Expected deaths	695
SMR [95% CI]	5.7 [5.5, 5.9]
Drug-related poisoning death
Number of deaths	1715
Rate per 10,000 pys [95% CI]	32 [30, 33]