Effect of birth season on case fatality rate of pulmonary tuberculosis: coincidence or causality?
The effects of birth season on the case fatality rate (CFR) of pulmonary tuberculosis were examined in case records of 9206 patients discharged during 1937-1965 from a national hospital for tuberculosis in Tokyo. The CFR was over 60% until 1945, then it decreased down to less than 9% after 1950. Male cases had little variation in their CFR by their birth season, while female cases had a significant variation and showed a significantly higher CFR than the male cases when they were born in January-June. The results suggest that the birth season had a significant influence on the prognosis of pulmonary tuberculosis.
Miura
T
T
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan.
Kawana
H
H
Karita
K
K
Ikegami
T
T
Katayama
T
T
D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D011379:Prognosis; D012621:Seasons; D012737:Sex Factors; D014397:Tuberculosis, Pulmonary / Q000401:mortality*