TABLE II.
Distribution of covariates across IgE categories (n = 478)
| IgE level categories | P value* | ||
|---|---|---|---|
| Low, n = 358 (75%) |
High, n = 120 (25%) |
||
| Maternal age (y), mean ± SD | 27 ± 5.7 | 26 ± 5.7 | .03 |
| Maternal race, no. (%) | .05 | ||
| Hispanic | 224 (62%) | 58 (48%) | |
| Black | 96 (27%) | 45 (38%) | |
| White | 13 (4%) | 7 (6%) | |
| Other/mixed | 25 (7%) | 10 (8%) | |
| Maternal education, no. (%) | .23 | ||
| < High school | 131 (37%) | 34 (28%) | |
| High school degree | 100 (28%) | 40 (33%) | |
| ≥ Some college | 105 (29%) | 39 (33%) | |
| Missing | 22 (6%) | 7 (6%) | |
| Current economic difficulties, mean ± SD | 5.6 ± 2.4 | 6.1 ± 2.7 | .04 |
| Prenatal smoking, no. (%) | .12 | ||
| Prenatal smoking | 46 (13%) | 14 (12%) | |
| No smoking | 304 (85%) | 103 (86%) | |
| Missing | 8 (2%) | 3 (2%) | |
| Maternal atopy, no. (%) | .01 | ||
| Atopy | 115 (32%) | 55 (46%) | |
| No atopy | 243 (68%) | 65 (54%) | |
| Parental home ownership, no. (%) | .001 | ||
| Parents owned home | 203 (57%) | 45 (37%) | |
| Parents did not own home | 114 (32%) | 61 (51%) | |
| Missing | 41 (11%) | 14 (12%) | |
| Child’s sex, no. (%) | .49 | ||
| Male | 184 (51%) | 66 (55%) | |
| Female | 174 (49%) | 54 (45%) | |
| Birth weight, z value for gestational age, mean ± SD | −0.4 ± 1.2 | −0.4 ± 1.3 | .72 |
| Season of birth, no. (%) | .45 | ||
| Winter | 95 (27%) | 40 (33%) | |
| Summer | 79 (22%) | 21 (17%) | |
| Spring | 90 (25%) | 27 (23%) | |
| Fall | 94 (26%) | 32 (27%) | |
| Other Current NLEs,† mean ± SD | 2.2 ± 2.6 | 2.5 ± 3.1 | .35 |
| Detectable dust mite‡ in home, no. (%) | .97 | ||
| Dust mite | 235 (66%) | 76 (63%) | |
| No dust mite | 92 (26%) | 30 (25%) | |
| Missing dust mite | 31 (8%) | 14 (12%) | |
| Detectable cockroach§ in home, no. (%) | .12 | ||
| Cockroach | 72 (20%) | 16 (13%) | |
| No cockroach | 255 (71%) | 90 (75%) | |
| Missing cockroach | 31 (9%) | 14 (12%) | |
*
For differences between nonmissing multigroup comparisons using ANOVA and χ2 distribution.
†
Current NLEs other than IPT.
‡
Detectable levels for dust mites (Der f 1 and Der p 1, >0.02 µg/g).
§
Detectable levels for cockroach allergens (Bla g 1, >0.40 U/g; Bla g 2, >1.0 U/g).