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Skip search results from other journals and go to results- 705 Journal of Medical Internet Research
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To assess the association between COVID-19 infection during pregnancy and preterm birth, we used the frequencies of these 2 categorical variables in a 2 × 2 contingency table to calculate the odds ratio (OR) with a 95% CI, where OR = (A/B) / (C/D) (Table 2).
J Med Internet Res 2025;27:e66097
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