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Prevalence of DR in different FT3 or FT4 quartiles (∗P < 0.05, ∗∗∗P < 0.001); FT3-Q1:FT3 quartile 1 (FT3 <4.35 pmol/L), FT3-Q2:FT3 quartile 2 (4.35 pmol/L ≤ FT3 <4.70 pmol/L), FT3-Q3:FT3 quartile 3 (4.70 pmol/L ≤ FT3 <5.08 pmol/L), FT3-Q4:FT3 quartile 4 (FT3 ≥5.08 pmol/L). FT4-Q1:FT4 quartile 1 (FT4 <14.98 pmol/L), FT4-Q2:FT4 quartile 2 (14.98 pmol/L ≤ FT4 <16.23 pmol/L), FT4-Q3:FT4 quartile 3 (16.23 pmol/L ≤ FT4 <17.79 pmol/L), FT4-Q4:FT4 quartile 4 (FT3 ≥17.79 pmol/L) (n = 633).
