Table 1.
Demographic Characteristics of Study Patients, by Type of Bordetella Infection—Wisconsin, 1 October 2011–31 May 2012
| Wisconsina | Wood Countyb | |||
|---|---|---|---|---|
| Characteristic | Parapertussis No. (%) (n = 218) | Coinfection No. (%) (n = 13) | Parapertussis No. (%) (n = 28) | Pertussis No. (%) (n = 103) |
| Age (yrs) | ||||
| <1 | 25 (11) | 1 (8) | 2 (7) | 3 (3) |
| 1–4 | 69 (32) | 2 (15) | 11 (39) | 7 (7) |
| 5–9 | 93 (43) | 3 (23) | 11 (39) | 20 (19) |
| 10–14 | 22 (10) | 4 (31) | 3 (11) | 49 (48) |
| 15–20 | 6 (3) | 2 (15) | 0 (0) | 17 (16) |
| ≥21 | 3 (1) | 1 (8) | 1 (4) | 7 (7) |
| Median (IQR)c | 5.6 (3.4–7.7) | 10.7 (5.5–14.5) | 5.3 (3.5–7.9) | 11.9 (9.2–14.6) |
| Sex | ||||
| Male | 121 (56) | 7 (54) | 14 (50) | 48 (47) |
| Female | 97 (44) | 6 (46) | 14 (50) | 55 (53) |
| Raced | ||||
| White | 156 (94) | 11 (92) | 13 (87) | 40 (95) |
| Black | 4 (2) | 0 (0) | 0 (0) | 0 (0) |
| Other | 6 (4) | 1 (8) | 2 (13) | 2 (5) |
| Ethnicityd | ||||
| Hispanic | 12 (8) | 0 (0) | 2 (14) | 0 (0) |
| Non-Hispanic | 146 (92) | 12 (100) | 12 (86) | 42 (100) |
Coinfection: Test results positive for both Bordetella parapertussis and Bordetella pertussis.
Abbreviation: IQR, interquartile range.
2010 US Census Bureau report for Wisconsin population of approximately 5.68 million persons.
2010 U.S. Census Bureau reports for Wood County, Wisconsin, population of approximately 74 000 persons.
Statewide, parapertussis patients were significantly younger than patients with coinfection (Mann–Whitney U test, P = .010). Among Wood County patients, parapertussis patients were significantly younger than pertussis patients (Mann–Whitney U test, P < .001).
Percentages exclude patients with missing information.