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October 2, 1987, Vol 258, No. 13 >
ARTICLE | October 2, 1987

Reflux Esophagitis and the Water Bed

Jerry Halpern, PhD
JAMA. 1987;258(13):1734. doi:10.1001/jama.1987.03400130048028.
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To the Editor.—  Wide reportage in the popular press of the letter by Kleinman and Plain1 has given the water bed industry heartburn. A representative of the National Waterbed Manufacturers Association, the industry's national trade association, asked me to review it.The correct P value2 is.051, not the reported "significant" P value of.035. This is only a careless mistake, but the letter is vague on many other important points.Were the cases that directed attention to water beds included in the study? This would be a more serious error. The minimal adjustment for it by deleting a single water bed user with reflux esophagitis increases the P value to.09. If only a subset of subjects with at least 2+ esophagitis was used, how was it chosen? The diagnosis of 2 + esophagitis is not clear-cut: "Erythema is difficult to distinguish from normal and friability depends on how hard you

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