Table 1.
Parameters of influenza A(H1N1)pdm09 activity by climatic region
| Parameters of A(H1N1)pdm09 activity | Temperate countries (n = 47) | Tropical and subtropical countries (n = 33) | P value |
|---|---|---|---|
| Peak A(H1N1)pdm09 weekly proportiona (peak activity) | 0·12 (0·09–0·14) | 0·09 (0·07–0·12) | <0·01 |
| No. of weeks between the 5th and 95th percentiles of cumulative weekly proportiona | 20 (13–24) | 27 (17–44) | <0·01 |
| No. of weeks from first detection to peak weeka | 25 (20–27) | 9 (6–16) | <0·01 |
| Countries with >1 wave, no. (%) | 16 (34) | 10 (30) | 0·81 |
Wilcoxon rank sum tests and Kruskal–Wallis tests were used to compare continuous data, chi‐square tests to compare categorical data.
a
Median (interquartile range).