Table 3.
Wald test chi-squared statistics for harmonic terms (with degrees of freedom) and seasonality parameters predicted by logistic model fitted with GEE by sample type
| Bangladesh | Brazila | India | Nepal | Pakistan | Perua | South Africaa | Tanzania | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Monthly samples only | Seasonality | 10.51† (4) | 12.41† (4) | 12.21† (4) | 18.00†† (4) | 37.92††† (4) | 14.18†† (4) | 5.65 (2) | 30.82††† (4) | |
| First peak | Timing | December 18 | May 17 | January 17 | January 12 | January 17 | October 9 | April 6 | June 11 | |
| Peak value | 0.04 | 0.02 | 0.04 | 0.02 | 0.04 | 0.02 | 0.01 | 0.06 | ||
| Amplitude | 0.03 | 0.02 | 0.04 | 0.02 | 0.04 | 0.02 | 0.01 | 0.05 | ||
| Second peak | Timing | June 29 | – | September 4 | – | July 17 | May 17 | – | December 25 | |
| Peak value | 0.01 | – | 0.01 | – | 0.01 | 0.02 | – | 0.05 | ||
| Amplitude | 0.00 | – | 0.01 | – | 0.00 | 0.02 | – | 0.04 | ||
| QIC statistic | 746.83 | 113.38 | 333.80 | 10 772.19 | 526.20 | 945.11 | 9479.01 | 939.72 | ||
| Diarrhoeal samples only | Seasonality | 44.02††† (4) | 13.68†† (4) | 12.54† (4) | 59.93††† (4) | 19.38††† (2) | 13.84†† (4) | 8.81 (4) | 2.54 (2) | |
| First peak | Timing | December 28 | September 29 | February 16 | January 18 | December 22 | April 21 | February 16 | April 30 | |
| Peak value | 0.24 | 0.00 | 0.21 | 0.24 | 0.08 | 0.07 | 0.16 | 0.80 | ||
| Amplitude | 0.19 | 0.00 | 0.20 | 0.23 | 0.07 | 0.05 | 0.16 | 0.72 | ||
| Second peak | Timing | July 15 | April 27 | September 19 | – | – | September 17 | August 2 | – | |
| Peak value | 0.06 | 0.00 | 0.14 | – | – | 0.04 | 0.16 | – | ||
| Amplitude | 0.01 | 0.00 | 0.13 | – | – | 0.02 | 0.16 | – | ||
| QIC statistic | 945.58 | 38.68 | 352.75 | 11 038.09 | 9053.31 | 688.75 | 100.78 | 75.13 | ||
†††p < 0.001, ††p = 0.001–0.01, †p = 0.01–0.05. Numbers in parentheses indicate degrees of freedom – the number of model terms selected for that covariate.
a
Country in which the rotavirus vaccine had been introduced at the time of the study.