Table 1:

Risk of overall and cause-specific mortality in opium user and non-user groups after four years of follow-up

Outcomes	Groups	Adverse outcome		Totals	Relative risk/hazard ratio	Patient's risks of adverse event
		Present	Absent
Overall mortality	Opium user	705	7782	8487	Rr=2.41	Ari=4.9%
					Hr=1.86	Nnh=20.4
	Non-opium user	1440	40118	41558
	Totals	2145	47900	50045
Circulatory diseases	Opium user	335	8152	8487	Rr=2.29	Ari=2.2%
	Non-opium user	738	40820	41558	Hr=1.81	Nnh=45.4
	Totals	1073	48972	50045
Ischaemic heart disease	Opium user	208	8279	8487	Rr=2.4	Ari=1.4%
	Non-opium user	416	41142	41558	Hr=1.90	Nnh=71.42
	Totals	624	49421	50045
Cerebrovascular event	Opium user	98	8389	8487	Rr=1.80	Ari=0.49%
	Non-opium user	254	41304	41558	Hr=1.68	Nnh=204.08
	Totals	352	49693	50045
Other circulatory diseases	Opium user	29	8458	8487	Rr=3	Ari=0.2%
	Non-opium user	68	41490	41558	Hr=1.73	Nnh=500
	Totals	97	49948	50045