Table 1. Characteristics of study participants enrolled through the University of Texas Medical Branch, Galveston, Texas, USA, 2003–2007*.
| Characteristic | No. (%) |
|---|---|
| Age at enrollment, mo | |
| 6–<12 | 92 (43.4) |
| 12–<18 | 62 (29.2) |
| 18–<24 | 30 (14.2) |
| 24–<36 |
28 (13.2) |
| Gender | |
| F | 103 (48.6) |
| M |
109 (51.4) |
| Race | |
| White | 124 (58.5) |
| Black | 62 (29.2) |
| Asian | 6 (2.8) |
| Other |
20 (9.4) |
| Ethnicity | |
| Hispanic or Latino | 95 (44.8) |
| Not Hispanic |
117 (55.2) |
| Day care† | |
| No | 147 (69.7) |
| Yes |
64 (30.3) |
| Breast-fed for >4 mo | |
| No | 173 (82.0) |
| Yes |
38 (18.0) |
| Environmental exposure to tobacco smoke‡ | |
| No | 145 (68.4) |
| Yes | 67 (31.6) |
*Data given for 212 participants who experienced at least 1 upper respiratory infection, were seen by a study physician, and had a nasopharyngeal swab collected for bacterial culture. An additional 82 enrollees were excluded from the study because they did not experience an upper respiratory infection and did not have a nasopharyngeal swab collected for bacterial culture. Some numbers do not add up to 212 because of missing data. †No. hours and days/week in day care were grouped into any or none. Environmental exposure to tobacco smoke was based on parental self-report.