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USMLE step 1 Equations with complete solutions | Latest 2023/2024
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USMLE step 1 Equations with complete solutions | Latest 2023/2024 Sensitivity -- Sensitivity = TP / (TP + FN) Specificity -- Specificity = TN / (TN + FP) Positive predictive value -- PPV = TP / (TP + FP) Negative predictive value -- NPV = TN / (TN + FN) Relative risk -- RR= (a/[a+b]) / (c/[c+d]) Attributable risk -- AR= (a/[a+b]) - (c/[c+d]) Number needed to treat -- 1/absolute risk reduction Number needed to harm -- 1/attributable risk Hardy-Weinberg equilibrium -- p^2 + 2pq + q^2 = 1 p+q=1 Henderson-Hasselbalch equation -- pH = pKa + log [HCO3-] / 0.03PCO2
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