Table 2.
Wald test chi-squared statistics for covariate predictors (with degrees of freedom) and seasonality parameters predicted by logistic model fitted with GEE
| Bangladesh | Brazila | India | Nepal | Pakistan | Perua | South Africaa | Tanzania | ||
|---|---|---|---|---|---|---|---|---|---|
| Calendar time | 31.62††† (4) | 8.06† (3) | 0.67 (1) | 5.78 (2) | 0.72 (1) | 94.95††† (4) | 3.32 (1) | 17.23†† (4) | |
| Age | 7.45†† (1) | 5.89 (4) | 13.11†† (3) | 18.52††† (4) | 0.37 (1) | 9.65††† (1) | 0.36 (1) | 0.36 (1) | |
| Seasonality | 54.45††† (4) | 11.18† (4) | 24.35††† (4) | 92.63††† (4) | 33.73††† (2) | 20.27††† (4) | 8.87† (2) | 39.37††† (4) | |
| 1st Peak | Timing | December 25 | October 3 | February 1 | January 16 | January 2 | May 3 | April 18 | June 12 |
| Peak value | 0.08 | 0.01 | 0.07 | 0.10 | 0.05 | 0.07 | 0.02 | 0.05 | |
| Amplitude | 0.06 | 0.01 | 0.07 | 0.09 | 0.04 | 0.05 | 0.01 | 0.05 | |
| 2nd Peak | Timing | Jul 15 | May 6 | Sep 13 | – | – | Oct 3 | – | December 24 |
| Peak value | 0.04 | 0.01 | 0.04 | – | – | 0.05 | – | 0.03 | |
| Amplitude | 0.02 | 0.01 | 0.04 | – | – | 0.03 | – | 0.03 | |
| QIC statistic | 1819.71 | 193.31 | 749.77 | 887.46 | 8903.42 | 1649.77 | 9200.47 | 1020.58 | |
a
Country in which the rotavirus vaccine had been introduced at the time of the study.
†††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.