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Davenport, Iowa, Oct. 14, 1905.
To the Editor:
—In The Journal of this date you refer to White, who considers the idea that a majority of labors terminate at night as probably fallacious and suggests a further consideration of statistics.In the Medical News, Sept. 12, 1891, Dr. G. W. H. Kemper recorded the statistics of 1,000 consecutive cases, 13 of which were twins, the hour of two births not recorded, leaving a total of 1,011 births. Dividing the day into six-hour periods beginning at midnight, there were in the first 291, in the second 267, in the third 222, and in the fourth 231 births, being an excess of 33 in favor of the night hours.Of the 250 consecutive labors of which I have kept notes 81 terminated in the first quarter of the day, 68 in the second, 43 in the third and 58 in the fourth,
Preston CH. The Proportion of Night Labors.. JAMA. 1905;XLV(17):1261. doi:10.1001/jama.1905.02510170053015