Table 1.
Baseline characteristics of the cases and control subjects
| Control N = 493 | Case N = 356 | P‐value | |
|---|---|---|---|
| Average enrollment age (SD) | 14.3 (3.8) | 15.2 (3.2) | <0.001a |
| Average disease duration in days (SD) | – | 347 (319) | |
| Sex | <0.001b | ||
| Male | 237 (48.1%) | 127 (35.7%) | |
| Female | 256 (51.9%) | 229 (64.3%) | |
| Race | 0.848b | ||
| White | 321 (69.5%) | 224 (67.7%) | |
| Black | 80 (17.3%) | 62 (18.7%) | |
| Other | 61 (13.2%) | 45 (13.6%) | |
| Ethnicity | <0.001b | ||
| Hispanic or latino | 84 (18.0%) | 108 (31.8%) | |
| Not hispanic or latino | 383 (82.0%) | 232 (68.2%) | |
| Mother's education | <0.001b | ||
| None | 26 (6.0%) | 35 (11.3%) | |
| High school or Associate's | 203 (47.0%) | 176 (56.6%) | |
| Bachelor's or Graduate | 203 (47.0%) | 100 (32.2%) | |
| Positive for HSV‐1 | 97 (20.0%) | 93 (26.4%) | 0.029b |
| Positive for HSV‐2 | 61 (12.6%) | 65 (18.7%) | 0.015b |
| Positive for CMV | 156 (32.0%) | 134 (38.0%) | 0.071b |
| Positive for EBV‐VCA | 284 (58.2%) | 325 (91.6%) | <0.001b |
| Positive for DRB1*15:01 or 15:03 | 109 (22.1%) | 141 (40.2%) | <0.001b |
a
Kruskal–Wallis test.
b
Chi‐squared test of no association.