Table 4 Interaction between FT3/FT4 and TG levels for the risk of GDM*
TG levels | Non-risk ratio (FT3/FT4 < 0.502) | Risk ratio (FT3/FT4 ≥ 0.502) | OR (95%CI) for risk ratio within category of blood lipid levels | AP (95%CI) | RERI (95%CI) | ||
|---|---|---|---|---|---|---|---|
GDM/Control (n) | OR (95%CI) | GDM/Control (n) | OR (95%CI) | ||||
Low levels (< 2.30) | 36/277 | 1.000 | 81/171 | 3.551 (2.289–5.508) P < 0.001 | 3.551 (2.289–5.508) P < 0.001 | 0.348 (0.081–0.614) P = 0.010 | 2.021 (0.064–3.978) P = 0.043 |
High levels (≥ 2.30) | 21/127 | 1.241 (0.694–2.218) P = 0.466 | 94/121 | 5.812 (3.733–9.049) P < 0.001 | 4.603 (2.688–7.881) P < 0.001 | ||
OR (95% CI) for high TG levels within category of thyroid function |  | 1.241 (0.694–2.218) P = 0.466 |  | 1.648 (1.127–2.410) P = 0.010 |  | ||