Table 3. Crude and adjusted geometric means of blood mercury levels (µg/L) according to participant general characteristics.
| Variable | No. | Geometric mean (95% CI) | |
|---|---|---|---|
| Crude | Adjusted† | ||
| Total | 1,567 | 1.93 (1.87–1.98) | |
| Sex | |||
| Girl | 774 | 1.85 (1.78–1.92) | 2.11 (1.88–2.36) |
| Boy | 793 | 2.01 (1.93–2.09)** | 2.25 (2.00–2.52)** |
| Age (yr) | |||
| 10–12‡ | 471 | 1.89 (1.81–2.18) | 2.16 (1.90–2.44) |
| 13–15 | 515 | 1.94 (1.84–2.03) | 2.21 (1.95–2.49) |
| 16–19 | 581 | 1.95 (1.87–2.03) | 2.17 (1.95–2.41) |
| Body mass index status | |||
| Underweight | 75 | 1.92 (1.68–2.19) | 2.05 (1.74–2.41) |
| Normal‡ | 1171 | 1.86 (1.80–1.92) | 2.00 (1.80–2.24) |
| Overweight | 198 | 2.20 (2.02–2.38)*** | 2.38 (2.08–2.72)*** |
| Obese | 123 | 2.17 (2.00–2.35)*** | 2.30 (2.02–2.62)** |
| Residential region | |||
| Urban‡ | 1,323 | 1.91 (1.85–1.97) | 2.11 (1.89–2.35) |
| Rural | 244 | 2.02 (1.88–2.16) | 2.25 (1.98–2.55) |
| Household income | |||
| Quartile 1‡ | 186 | 1.94 (1.79–2.10) | 2.21 (1.94–2.52) |
| Quartile 2 | 414 | 1.81 (1.73–1.90) | 2.02 (1.79–2.27) |
| Quartile 3 | 488 | 1.94 (1.84–2.04) | 2.18 (1.93–2.46) |
| Quartile 4 | 463 | 2.06 (1.95–2.19) | 2.32 (2.06–2.61) |
| Smoking status | |||
| Nonsmoker‡ | 851 | 1.88 (1.81–1.96) | 2.12 (1.88–2.38) |
| Secondhand smoke exposure | 619 | 1.98 (1.89–2.06) | 2.21 (1.98–2.47) |
| Current smoker | 86 | 2.00 (1.83–2.19) | 2.21 (1.93–2.52) |
| Drinking habits | |||
| Nondrinker‡ | 1,371 | 1.91 (1.85–1.98) | 2.10 (1.90–2.32) |
| Light drinker | 139 | 2.02 (1.88–2.16) | 2.21 (1.97–2.48) |
| Heavy drinker | 45 | 2.15 (1.80–2.56) | 2.22 (1.83–2.69) |
| Anemia | |||
| No‡ | 1,545 | 1.93 (1.88–1.99) | 2.15 (1.99–2.31) |
| Yes | 22 | 1.80 (1.52–2.13) | 2.21 (1.84–2.64) |
CI, confidence interval.
**P<0.001. ***P<0.0001.
†Adjusted for all variables in the table. ‡Reference for comparison of geometric mean in each variables†.