Altman, Douglas G . Practical statistics for medical research / by Douglas G. Altman. - 1st ed / . - New York : Chapman and Hall , 1991. - x, 611p. : Diagrams , tables, charts ; 25cm . Includes index ISBN: 0412386208 NULL Subjects--Index Terms: MEDICINE STATISTICS Dewey Class. No.: 610.72 / ALT/P