💡 Cohort = Relative Risk (Prospective). Case-Control = Odds Ratio (Retrospective).

💡 SD = 68-95-99.7 rule. P-value < 0.05 = reject null hypothesis.

💡 Sensitivity = TP / (TP+FN). Specificity = TN / (TN+FP).

💡 Live vaccines = BCG, OPV, MMR, Yellow Fever. Cold chain: +2 to +8 C.