CITY REPORTS FOR WEEK ENDED DECEMBER 30, 1922-Continued. POLIOMYELITIS (INFANTILE PARALYSIS). The column headed "Median for previous years," gives the median number of cases reported during the corresponding weeks of the years 1915 to 1921, inclusive. In instances in which data for the full seven years are incomplete, the median is that for the number of years for which information is available. See p. 117; also Current State summaries, p. 106; and Monthly summaries, by States, p. 110. SMALLPOX. The column headed "Median for previous years," gives the median number of cases reported during the corresponding weeks of the years 1915 to 1921, inclusive. In instances in which data for the full seven years are incomplete, the median is that for the number of years for which information is available. CITY REPORTS FOR WEEK ENDED DECEMBER 30, 1922-Continued. The column headed "Median for previous years," gives the median number of cases reported during the corresponding weeks of the years 1915 to 1921, inclusive. In instances in which data for the full seven years are incomplete, the median is that for the number of years for which information is available. |