Table 1.
Characterization of Subjects in the Analytical Cohort by Rotavirus Vaccination Status
| Variable | Not Vaccinated (n = 64 099), No. | Full Vaccination (n = 186 502), No. | P Value |
|---|---|---|---|
| Age | |||
|
| |||
| 6–11 wk | 0 | 4 (<1%) | <.001a |
| 12–19 wk | 1018 (2%) | 1651 (1%) | |
| 20–34 wk | 5839 (9%) | 3434 (2%) | |
| 35–48 wk | 57 242 (89%) | 181 413 (97%) | |
|
| |||
| Sex | |||
|
| |||
| Female | 30 958 (48%) | 91 241 (49%) | .006a |
| Male | 33 141 (52%) | 95 261 (51%) | |
|
| |||
| Seizure | |||
|
| |||
| Yes | 669 (1%) | 1575 (1%) | <.001a |
| No | 63 429 (99%) | 184 920 (99%) | |
|
| |||
| Seasonality of seizure event | |||
|
| |||
| January–June | 369 (55%) | 774 (49%) | .010a |
| July–December | 300 (45%) | 801 (51%) | |
|
| |||
| Days since vaccination that seizure occurredb | |||
|
| |||
| 29–88 d | 99 (15%) | 249 (16%) | .581 |
| 89–148 d | 114 (17%) | 246 (16%) | |
| 149–208 d | 114 (17%) | 297 (19%) | |
| 209–268 d | 140 (21%) | 345 (22%) | |
| 269–328 d | 139 (21%) | 285 (18%) | |
| 329–388 d | 63 (9%) | 153 (10%) | |
For unvaccinated children, an index date was randomly selected by a computer program to fall within the age recommended by the Advisory Committee on Immunization Practices for receiving rotavirus vaccination.
a
Statistically significant.
b
The date of last rotavirus vaccination serves as the index date for those vaccinated.