Figure 3.

Probability distributions characterizing the observed times between symptom onset and hospitalization for four age groups ((a) 0–24 years, (b) 25–49 years, (c) 50–74 years and (d) 75–100 years, encompassing 104, 734, 904 and 248 cases, respectively). These figures represent the proportion of the population captured in the survey. A comparative analysis of the delay distribution is then conducted across these distinct age groups. The probability distributions of the gamma, Weibull and lognormal distributions illustrate the distribution of times from symptom onset to hospitalization for each specific age group.