Table 3.

The incidence relative risks (IRRs) between period, season, and death cases in Hanoi, Vietnam, 2005–2010

	Total death cases			Male death cases			Female death cases
	IRR	p	95% CI	IRR	p	95% CI	IRR	p	95% CI
Period (reference: 2005)
2006	0.95	0.205	0.87–1.03	0.97	0.503	0.89–1.05	0.96	0.414	0.87–1.06
2007	0.96	0.400	0.88–1.05	0.99	0.783	0.91–1.07	0.98	0.714	0.89–1.08
2008	1.03	0.525	0.94–1.12	1.04	0.351	0.96–1.12	1.07	0.165	0.97–1.18
2009	0.84	0.000	0.77–0.92	0.86	0.000	0.79–0.93	0.87	0.003	0.79–0.95
2010	1.01	0.769	0.93–1.10	1.05	0.252	0.97–1.13	1.02	0.627	0.93–1.13
Cold season (reference: warm season)	1.21	0.000	1.15–1.28	1.18	0.000	1.12–1.23	1.23	0.000	1.16–1.29

Bold values denotes for significant difference with p<0.001.