Table 1.
Characteristics of Bordetella pertussis positive children (cases) and matched controls.
| Cases (n = 145) | Controls (n = 2,900) | p-value | |
|---|---|---|---|
| Sex | 1.0000 | ||
| Male | 81 (55.9) | 1,620 (55.9) | |
| Female | 64 (44.1) | 1,280 (44.1) | |
| Age at index date, mean (SD), months | 9.77 (8.57) | 9.77 (8.55) | 1.0000 |
| Age group, months | 0.9775 | ||
| <12 | 106 (73.1) | 2,116 (73.0) | |
| 12–23 | 26 (17.9) | 529 (18.2) | |
| 24–35 | 13 (9.0) | 255 (8.8) | |
| Region of residencea | 1.0000 | ||
| Northern | 62 (42.8) | 1,240 (42.8) | |
| Central | 15 (10.3) | 300 (10.3) | |
| Southern | 13 (9.0) | 260 (9.0) | |
| Others | 55 (37.9) | 1,100 (37.9) | |
| Year of index date | 1.0000 | ||
| 1996–2007 | 100 (69.0) | 2,000 (69.0) | |
| 2008–2011 | 29 (20.0) | 580 (20.0) | |
| 2012–2015 | 16 (11.0) | 320 (11.0) |
SD, standard deviation.
a
Northern (from Keelung to Miaoli), Central (Taichung, Changhua, and Nantou), and Southern (from Yunlin to Pingtung) Taiwan are broad geographic regions along the west coast. Other regions included Eastern Taiwan (Hualien and Taitung) and offshore islands (Penghu, Kinmen, and Lienchiang).