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In the article by F. Howell Wright et al titled "A Controlled Follow-Up
Study of Small Prematures," published in the October issue (124:506-521, 1972), the formula for arriving at an approximate P value for the significance of the differences between premature and control variables (p 521) is incorrect. In the denominator of the formula, the square root sign should encompass the whole of the denominator instead of just the one-quarter figure. a 1 a+b 2
Denominator Error.. Am J Dis Child. 1972;124(6):929. doi:10.1001/archpedi.1972.02110180131021