Table 3.
Estimated Marginal Geometric Mean * of Thyroid hormones for each round of measurement for conventional and organic farmers.
| Parameter | Round One Mean (95%CI) |
Round Two Mean (95%CI) |
Round Three Mean (95%CI) |
Round Four Mean (95%CI) |
|---|---|---|---|---|
| TSH (µIU/mL) | ||||
| Conventional farmers | 1.28(1.16–1.42) ** | 1.38(1.23–1.54) ** | 1.36(1.22–1.51) ** | 1.48(1.33–1.64) ** |
| Organic farmers | 0.90(0.82–0.99) | 1.04(0.94–1.15) | 1.02(0.93–1.12) | 1.20(1.10–1.31) |
| FT4 (ng/dL) | ||||
| Conventional farmers | 0.82(0.80–0.85) | 0.91(0.89–0.93) | 0.82(0.80–0.83) ** | 0.84(0.82–0.86) |
| Organic farmers | 0.82(0.80–0.84) | 0.93(0.90–0.95) | 0.88(0.86–0.90) | 0.84(0.82–0.85) |
| FT3 (ng/dL) | ||||
| Conventional farmers | 0.33(0.32–0.34) ** | 0.36(0.34–0.37) | 0.34(0.33–0.36) ** | 0.35(0.34–0.36) ** |
| Organic farmers | 0.31(0.31–0.32) | 0.35(0.34–0.36) | 0.32(0.31–0.33) | 0.31(0.30–0.32) |
| T4 (µg/dL) | ||||
| Conventional farmers | 8.32(8.03–8.63) | 7.71(7.50–7.92) | 8.08(7.52–8.69) ** | 7.97(7.68–8.27) ** |
| Organic farmers | 8.01(7.76–8.28) | 7.80(7.61–8.00) | 7.09(6.65–7.56) | 7.26(7.02–7.50) |
| T3 (ng/mL) | ||||
| Conventional farmers | 1.03(0.99–1.07) ** | 1.00(0.97–1.04) | 0.91(0.85–0.96) ** | 0.94(0.90–0.97) ** |
| Organic farmers | 0.86(0.83–0.90) | 1.02(0.99–1.06) | 0.75(0.71–0.80) | 0.85(0.82–0.88) |
* Linear regression of Ln thyroid hormone level for each round with a random intercept for subjects by conventional and organic farmers after controlling BMI, gender, and baseline age. ** Significant differences at p < 0.005.