Table 3.
Weighted characteristics of the NHANES participants from 2007 to 2012 according to age groups.
| Variables | Total (n = 1,315) | 20–39 years (n = 437) | 40–59 years (n = 430) | ≥60 years (n = 448) | p-value |
|---|---|---|---|---|---|
| Gender, n (%) | 0.271 | ||||
| Male | 652 (49.582) | 217 (49.657) | 225 (52.326) | 210 (46.875) | |
| Female | 663 (50.418) | 220 (50.343) | 205 (47.674) | 238 (53.125) | |
| Race, n (%) | 0.003 | ||||
| Mexican American | 232 (17.643) | 92 (21.053) | 81 (18.837) | 59 (13.17) | |
| Other Hispanic | 145 (11.027) | 45 (10.297) | 55 (12.791) | 45 (10.045) | |
| Non-Hispanic White | 630 (47.909) | 187 (42.792) | 192 (44.651) | 251 (56.027) | |
| Non-Hispanic Black | 245 (18.631) | 87 (19.908) | 84 (19.535) | 74 (16.518) | |
| Other races | 63 (4.791) | 26 (5.95) | 18 (4.186) | 19 (4.241) | |
| Educational level (%) | 0.337 | ||||
| Below high school | 371 (28.213) | 121 (27.689) | 113 (26.279) | 137 (30.58) | |
| High school | 317 (24.106) | 99 (22.654) | 103 (23.953) | 115 (25.67) | |
| Above high school | 627 (47.681) | 217 (49.657) | 214 (49.767) | 196 (43.75) | |
| Marital status (%) | <0.001 | ||||
| Married | 236 (17.947) | 176 (40.275) | 43 (10) | 17 (3.795) | |
| Never married | 768 (58.403) | 225 (51.487) | 282 (65.581) | 261 (58.259) | |
| Widowed/Divorced/Separated | 311 (23.65) | 36 (8.238) | 105 (24.419) | 170 (37.946) | |
| Smoking status (%) | <0.001 | ||||
| Never | 685 (52.091) | 251 (57.437) | 207 (48.14) | 227 (50.67) | |
| Former | 317 (24.106) | 56 (12.815) | 96 (22.326) | 165 (36.83) | |
| Current | 313 (23.802) | 130 (29.748) | 127 (29.535) | 56 (12.5) | |
| Alcohol use (%) | <0.001 | ||||
| Non-drinker | 221 (16.806) | 55 (12.586) | 58 (13.488) | 108 (24.107) | |
| Moderate drinker | 485 (36.882) | 115 (26.316) | 153 (35.581) | 217 (48.438) | |
| Heavy drinker | 609 (46.312) | 267 (61.098) | 219 (50.93) | 123 (27.455) | |
| Body mass index (%) | <0.001 | ||||
| <25 kg/m2 | 381 (28.973) | 161 (36.842) | 103 (23.953) | 117 (26.116) | |
| 25–29.9 kg/m2 | 472 (35.894) | 147 (33.638) | 162 (37.674) | 163 (36.384) | |
| ≥30 kg/m2 | 462 (35.133) | 129 (29.519) | 165 (38.372) | 168 (37.5) | |
| Pesticide metabolic compound | |||||
| 2,4-D (μg/L) | 0.595 ± 1.424 | 0.528 ± 1.04 | 0.641 ± 2.008 | 0.616 ± 1.016 | 0.465 |
| 4F3PB (μg/L) | 0.088 ± 0.122 | 0.087 ± 0.097 | 0.086 ± 0.095 | 0.092 ± 0.159 | 0.746 |
| 3P (μg/L) | 1.361 ± 3.498 | 1.528 ± 4.145 | 1.617 ± 3.802 | 0.954 ± 2.256 | 0.009 |
| PN (μg/L) | 1.366 ± 2.736 | 1.444 ± 2.964 | 1.268 ± 2.325 | 1.386 ± 2.868 | 0.627 |
| TDDC (μg/L) | 1.257 ± 3.354 | 1.154 ± 3.119 | 1.484 ± 3.728 | 1.14 ± 3.189 | 0.233 |
| Thyroid function index | |||||
| FT3 (pg/mL) | 3.169 ± 0.409 | 3.341 ± 0.383 | 3.183 ± 0.415 | 2.989 ± 0.35 | <0.001 |
| FT4 (ng/dL) | 0.79 ± 0.158 | 0.78 ± 0.127 | 0.775 ± 0.165 | 0.813 ± 0.176 | <0.001 |
| TSH (mIU/L) | 2.081 ± 2.745 | 1.758 ± 1.263 | 2.03 ± 3.11 | 2.445 ± 3.328 | <0.001 |
| TT3 (ng/dL) | 111.72 ± 23.042 | 118.043 ± 20.982 | 114.286 ± 24.429 | 103.089 ± 20.938 | <0.001 |
| TT4 (μg/dL) | 7.862 ± 1.672 | 7.803 ± 1.656 | 7.764 ± 1.676 | 8.014 ± 1.677 | 0.057 |
| Tg (ng/mL) | 16.333 ± 35.266 | 15.315 ± 31.046 | 14.103 ± 19.414 | 19.467 ± 48.357 | 0.06 |
| TgAb (IU/mL) | 10.155 ± 82.148 | 10.722 ± 9.299 | 8.819 ± 81.876 | 19.664 ± 114.705 | 0.005 |
| TPOAb (IU/mL) | 19 ± 87.976 | 14.167 ± 79.862 | 25.638 ± 108.061 | 17.345 ± 72.499 | 0.14 |
Continuous data are displayed as mean ± standard deviation. Categorical variables are presented as n (%), where n is the number of participants and % is the weighted percentage. p < 0.05 was considered statistically significant. The bold type means statistically significant.