Table 1. Sample characteristics by NHANES wave.
| NHANES 2003/04 | NHANES 2005/06 | Test of difference between NHANES years* | Pooled data | |
| N (% of sample) | N (% of sample) | p-value | N (% of sample) | |
| Gender | 0.730 | |||
| Men | 694 (48.2%) | 720 (49.1%) | 1414 (48.6%) | |
| Women | 761 (51.8%) | 773 (51%) | 1534 (51.4%) | |
| Age-group (yrs) | 0.617 | |||
| 18–29 | 449 (23.5%) | 476 (22.9%) | 925 (23.2%) | |
| 30–39 | 244 (20.4%) | 269 (19.9%) | 513 (20.1%) | |
| 40–49 | 252 (22.8%) | 250 (22.3%) | 502 (22.6%) | |
| 50–59 | 182 (17.7%) | 201 (18.5%) | 383 (18.1%) | |
| 60–74 | 328 (15.7%) | 297 (16.5%) | 625 (16.1%) | |
| Race/ethnicity | 0.650 | |||
| Mexican American | 324 (8.5%) | 312 (8.2%) | 636 (8.3%) | |
| Other Hispanic | 57 (4.3%) | 51 (3.4%) | 108 (3.9%) | |
| Non-Hispanic White | 690 (69.2%) | 669 (70.6%) | 1359 (69.9%) | |
| Non-Hispanic Black | 313 (11.6%) | 396 (12.2%) | 709 (11.9%) | |
| Other race (including multi-racial) | 71 (6.4%) | 65 (5.5%) | 136 (6%) | |
| Level of education | 0.332 | |||
| Less than high school diploma | 430 (18.1%) | 390 (16.1%) | 820 (17.1%) | |
| High school diploma (including GED) | 356 (25.9%) | 383 (24.8%) | 739 (25.3%) | |
| Some college education | 669 (56.1%) | 719 (59%) | 1388 (57.6%) | |
| Unknown | n/a | 1 (0.1%) | 1 (0.06%) | |
| Household annual income | 0.160 | |||
| <$20,000 | 342 (15.9%) | 299 (13%) | 641 (14.4%) | |
| $20,000 to $35,000 | 306 (18.1%) | 286 (16.2%) | 592 (17.2%) | |
| $35,000 to $65,000 | 354 (27%) | 374 (26.1%) | 728 (26.5%) | |
| >$65,000 | 354 (33.4%) | 452 (40.3%) | 806 (36.9%) | |
| Unknown | 99 (5.6%) | 82 (4.4%) | 181 (5%) | |
| Body mass Index (BMI) | 0.526 | |||
| Low weight, BMI<18.5 | 31 (2.1%) | 34 (2.7%) | 65 (2.4%) | |
| Recommended, BMI 18.5 to 24.9 | 469 (33.6%) | 440 (30.8%) | 909 (32.2%) | |
| Overweight, BMI 25.0 to 29.9 | 448 (30.4%) | 486 (31.5%) | 934 (30.9%) | |
| Obese I, BMI 30.0 to 34.9 | 283 (20%) | 292 (18.7%) | 575 (19.3%) | |
| Obese II, BMI> = 35 | 199 (12.2%) | 231 (15.7%) | 430 (14%) | |
| Unknown | 25 (1.6%) | 10 (0.6%) | 35 (1.1%) | |
| Cigarette smoking | 0.594 | |||
| <100 cigarettes in lifetime | 640 (48.8%) | 715 (48.6%) | 1355 (48.7%) | |
| Former smoker | 311 (22.6%) | 292 (22%) | 603 (22.3%) | |
| Some days | 63 (4.4%) | 48 (3.2%) | 111 (3.8%) | |
| Every day | 264 (20.5%) | 277 (22.7%) | 541 (21.7%) | |
| Unknown | 177 (3.8%) | 161 (3.6%) | 338 (3.7%) |
*
Note: estimate based on survey weighted age, sex ethnicity adjusted logistic models in adults aged 18–74 years with valid BPA measures, comparing NHANES wave.