Monroe's monograph is based upon a study of the records of 7,941 persons past the age of 61 years who entered the Peter Bent Brigham Hospital, Boston, from its opening in March, 1913, to March 1943. The inclusion of the early data with those gathered more recently obviously makes the study of rather limited value, since medicine has changed considerably during the past 15 years. For example, consider the value of the data on lobar (pneumococcic) pneumonia before the advent of antibiotic agents in light of medicine today. The same is true for the psychoses, psychoneuroses, coronary artery disease, and diagnostic laboratory procedures, including liver-function tests, electrocardiography, and immunologic, vitamin, and hematologic studies, to mention only a few. Furthermore, many diseases were unknown during the early period of this study.
Most of the study is of a statistical nature. The data were obtained from the records and not by the
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