The analyses using the proportional hazards model showed that gender, time from illness onset to hospital admission, general symptoms and respiratory symptoms were all related to the outcome of the H1N1 patients (Table 2) . Compared with male patients, females patients had a lower porpotion of recovery (HR 0.9, 95%CI: 0.7-1.0), but the differnence was not statistically significant. Delay in hospital admission (longer than 2 days) decreased the probability of recovery (HR 0.6, 95%CI: 0.5-0.7). General symptoms and respiratory symptoms were adversely associated with the rate of recovery in hospital with HR of 0.7 (95%CI: 0.5-1.0) and 0.3 (95%CI: 0.2-0.4), respectively. Showed in Figure 1 are the cumulative resolution rates. It is apparent that the cumulative resolution rate was lower in patients with delayed hospital admission than in those promptly admitted (x 2 = 60.978, P,0.001), and lower in patients with general symptoms (x 2 = 3.977, P = 0.046) or respiratory symptoms (x 2 = 100.261, P,0.001) than in those without corresponding symptoms. No significant difference was observed between genders (x 2 = 1.634, P = 0.201).