In total, 169 (3.9%) of the women had postpartum thyroiditis.

总共169例妇女(3.9%)患有产后甲状腺炎。

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The incidence of postpartum thyroiditis was 3.9% (169 of 4384).

结果：产后甲状腺炎的发病率为3.9％（169/4384）。

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Context: the incidence of postpartum thyroiditis (PPT) varies widely in the literature.

背景：文献中产后甲状腺炎的发生率(PPT)差异很大。

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