Table I.
Baseline Characteristics of the NHANES 2005–2006 Subjects
| All | Milk | Egg | Peanut | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N=6963 | Sensitized N=350 | Non-Sensitized N=5749 | P-value | Sensitized N=248 | Non-Sensitized N=5923 | P-value | Sensitized N=489 | Non-Sensitized N=5690 | P-value | |
| Age | <0.0001 | <0.0001 | 0.023 | |||||||
| 1–5 years | 480 (7.0%) | 72 (20.6%) | 259 (4.5%) | 47 (19.0%) | 290 (4.9%) | 27 (5.5%) | 313 (5.5%) | |||
| 6–17 years | 1206 (17.6%) | 87 (24.8%) | 943 (16.4%) | 41 (16.7%) | 1007 (17.0%) | 109 (22.2%) | 939 (16.5%) | |||
| ≥18 years | 5166 (75.4%) | 191 (54.6%) | 4547 (79.1%) | 159 (64.3%) | 4632 (78.2%) | 354 (72.3%) | 4444 (78.1%) | |||
| Gender - Female | 3558 (51.1%) | 159 (45.4%) | 2949 (51.3%) | 0.17 | 127 (51.1%) | 3021 (51.0%) | 0.99 | 175 (35.7%) | 2976 (52.3%) | 0.0006 |
| Race | 0.11 | 0.56 | 0.0001 | |||||||
| Non-Hispanic white | 4742 (68.1%) | 215 (61.4%) | 3996 (69.5%) | 177 (71.2%) | 4081 (68.9%) | 270 (55.2%) | 3989 (70.1%) | |||
| Other Hispanic | 251 (3.6%) | 17 (4.8%) | 201 (3.5%) | 7 (2.7%) | 213 (3.6%) | 25 (5.2%) | 193 (3.4%) | |||
| Mexican-American | 655 (9.4%) | 35 (10.0%) | 540 (9.4%) | 19 (7.7%) | 557 (9.4%) | 61 (12.5%) | 518 (9.1%) | |||
| Non-Hispanic Black | 856 (12.3%) | 53 (15.1%) | 673 (11.7%) | 27 (10.8%) | 711 (12.0%) | 99 (20.3%) | 637 (11.2%) | |||
| Other | 453 (6.5%) | 30 (8.7%) | 351 (6.1%) | 19 (7.6%) | 367 (6.2%) | 34 (6.9%) | 353 (6.2%) | |||
| Region | 0.014 | 0.71 | 0.20 | |||||||
| Northeast | 1010 (14.5%) | 40 (12.0%) | 795 (14.8%) | 29 (12.2%) | 807 (14.6%) | 55 (12.1%) | 781 (14.7%) | |||
| Midwest | 1769 (25.4%) | 74 (22.4%) | 1364(25.4%) | 62 (26.3%) | 1376 (24.9%) | 89 (19.5%) | 1350 (25.4%) | |||
| South | 2033 (29.2%) | 138 (41.9%) | 1499 (27.9%) | 80 (34.0%) | 1609 (29.1%) | 153 (33.5%) | 1541 (29.0%) | |||
| West | 2159 (31.0%) | 78 (23.7%) | 1719 (32.0%) | 65 (27.5%) | 1736 (31.4%) | 160 (34.9%) | 1642 (30.9%) | |||
| Urban | 4986 (71.6%) | 194 (63.4%) | 3644 (71.6%) | 0.037 | 141 (68.3%) | 3738 (71.2%) | 0.45 | 342 (77.7%) | 3546 (70.6%) | 0.037 |
| Number of People per Household | 3.4 (1.6) | 3.6 (1.9) | 3.3 (1.6) | 0.028 | 3.3 (1.6) | 3.3 (1.6) | 0.99 | 3.7 (1.8) | 3.3 (1.6) | 0.010 |
| Country of Birth | 0.0003 | 0.0002 | 0.20 | |||||||
| United States | 6119 (87.9%) | 337 (96.3%) | 5018 (87.3%) | 241 (97.2%) | 5177 (87.4%) | 417 (85.2%) | 5007 (88.0%) | |||
| Mexico | 313 (4.5%) | 5 (1.5%) | 276 (4.8%) | 5 (2.0%) | 278 (4.7%) | 31 (6.3%) | 256 (4.5%) | |||
| Elsewhere | 529 (7.6%) | 8 (2.3%) | 454 (7.9%) | 2 (0.81%) | 462 (7.8%) | 42 (8.5%) | 427 (7.5%) | |||
| Time in US ≥ 4 years | 4178 (60.0%) | 138 (39.3%) | 3570 (62.1%) | 0.084 | 151 (61.0%) | 3643 (61.5%) | 0.98 | 235 (48.1%) | 3579 (62.9%) | 0.036 |
| Family PIR <1.85 (Poverty) | 2182 (32.8%) | 135 (38.5%) | 1839 (32.0%) | 0.083 | 79 (31.8%) | 1919 (32.4%) | 0.88 | 182 (37.1%) | 1822 (32.0%) | 0.24 |
| Wheezing in Chest in Past Year | 1128 (16.2%) | 79 (22.5%) | 937 (16.3%) | 0.12 | 63 (25.6%) | 971 (16.4%) | 0.014 | 118 (24.1%) | 916 (16.1%) | 0.001 |
Number (%) or Mean (Standard Deviation)
Sensitized = Serum specific IgE ≥ 0.35 kUA/L; Non-Sensitized = Serum specific IgE <0.35 kUA/L
Means were compared with Student’s t-test, and proportions were compared with Pearson’s Chi-squared test.
PIR = Poverty Income Ratio (the ratio of income to the family’s poverty threshold)16