Table 1. Participant Characteristics.
| Characteristic | Participant groupa | |
|---|---|---|
| Bacterial meningitis (n = 3623) | Controls (n = 32 607) | |
| Sex | ||
| Female | 1603 (44.2) | 14 427 (44.2) |
| Male | 2020 (55.8) | 18 180 (55.8) |
| Age at diagnosis of bacterial meningitis, y | ||
| Mean (SD) | 4.1 (5.1) | 4.1 (5.1) |
| Median (IQR) | 1.5 (0.4-6.2) | 1.5 (0.5-6.2) |
| Age group | ||
| 0 | 1451 (40.0) | 12 435 (38.1) |
| 1 | 595 (16.4) | 5697 (17.5) |
| 2-4 | 548 (15.1) | 5204 (16.0) |
| 5-17 | 1029 (28.4) | 9271 (28.4) |
| Educational attainment of mother | ||
| Primary school | 425 (11.7) | 3572 (11.0) |
| High school | 1639 (45.2) | 14 800 (45.4) |
| University | 1537 (42.4) | 14 044 (43.1) |
| Missing | 22 (0.6) | 191 (0.6) |
| Educational attainment of father | ||
| Primary school | 627 (17.3) | 5515 (16.9) |
| High school | 1750 (48.3) | 15 722 (48.2) |
| University | 1185 (32.7) | 10 811 (33.2) |
| Missing | 61 (1.7) | 559 (1.7) |
| Birth characteristics | ||
| 5-min Apgar score, mean (SD) | 9.6 (1.0) | 9.7 (0.7) |
| Birth weight, mean (SD), g | 3430 (716) | 3515 (573) |
| Head circumference, mean (SD), cm | 34.5 (2.2) | 34.8 (1.7) |
| Preexisting conditions | ||
| Malignant neoplasms | 81 (2.2) | 19 (0.1) |
| Perinatal complications | 418 (11.5) | 2264 (6.9) |
| Mental and behavioral disorders | 70 (1.9) | 363 (1.1) |
| Diseases of the nervous system | 296 (8.2) | 564 (1.7) |
| Congenital disabilities | 254 (7.0) | 1073 (3.3) |
| Traumatic injuries | 70 (1.9) | 358 (1.1) |
| Operation in nervous system | 395 (10.9) | 1265 (3.9) |
a
Unless otherwise indicated, data are expressed as No. (%) of participants. Percentages have been rounded and may not total 100.