Table 1.
Summary of demographic and exposure variables by recurrent dry night cough (RNC) ever vs. never at age one, two, and/or three
| No RNC (n = 335)* | RNC at Age 1, 2, and/or 3 (n = 215)* | χ2 p value | |
|---|---|---|---|
| Female (n = 251) | 153 (45.7%) | 98 (45.6%) | 0.98 |
| African–American (n = 99) | 53 (15.8%) | 46 (21.4%) | 0.10 |
| Breastfed (n = 391) | 250 (74.6%) | 141 (65.6%) | 0.02 |
| Wheeze (n = 175) | 79 (23.6%) | 96 (44.7%) | <0.01 |
| Mother smokes (n = 68) | 39 (11.6%) | 29 (13.5%) | 0.52 |
| Maternal asthma (n = 134) | 76 (22.7%) | 58 (27.0%) | 0.25 |
| Paternal asthma (n = 76) | 45 (13.5%) | 31 (14.4%) | 0.75 |
| Dog in home (n = 198) | 120 (35.8%) | 78 (36.3%) | 0.91 |
| Cat in home (n = 127) | 78 (23.3%) | 49 (22.8%) | 0.89 |
| Visible mold (n = 276) | 170 (54.1%) | 106 (54.6%) | 0.91 |
| Highest traffic exhaust† (n = 198) | 104 (31.1%) | 94 (43.7%) | <0.01 |
| Highest endotoxin† (n = 162) | 103 (33.6%) | 59 (30.7%) | 0.51 |
| Highest dust mite† (n = 188) | 118 (37.7%) | 70 (35.5%) | 0.62 |
*
Denominators may vary slightly.
†
Highest = above the top tertile of exposure: traffic exhaust = 0.375 μg/m3, endotoxin = 133 EU/mg, dust mite = 22 EU/mg.