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In the Brief Report, "The Protective Efficacy of Immune Serum Globulin in Hepatitis A: A Statistical Approach," published in the Jan 1 issue (223:74-75, 1973), two errors occurred on page 75. In the formula given in the second column, the denominator should be AU, not AR; and AI stands for attack rate for inoculated, not attack rate for uninoculated, as printed.
Erroneous Formula. JAMA. 1973;223(8):912. doi:10.1001/jama.1973.03220080042011
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