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Relationship between mortality and rice cadmium concentration in inhabitants of the polluted Jinzu River basin, Toyama, Japan: A 26 year follow‐up
Author(s) -
Nogawa Kazuhiro,
Suwazono Yasushi,
Nishijo Muneko,
Sakurai Masaru,
Ishizaki Masao,
Morikawa Yuko,
Watanabe Yuuka,
Kido Teruhiko,
Nakagawa Hideaki
Publication year - 2018
Publication title -
journal of applied toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.784
H-Index - 87
eISSN - 1099-1263
pISSN - 0260-437X
DOI - 10.1002/jat.3593
Subject(s) - cadmium , hazard ratio , proportional hazards model , medicine , toxicology , cadmium exposure , environmental health , kidney disease , confidence interval , toxicity , biology , surgery , chemistry , organic chemistry
The aim of this study was to investigate the relationship between mortality and rice cadmium (Cd) concentration in inhabitants of a polluted area in Japan. The target subjects were inhabitants of the Jinzu River basin who participated in health examinations for screening of renal dysfunction from 1979 to 1984. The mean rice Cd concentration in each hamlet was used as an index of the Cd exposure. We conducted a 26 year follow‐up survey in 3281 inhabitants (1544 men and 1737 women) whose data regarding the rice Cd concentration were available. Mortality risk ratios for all and specific causes were estimated after adjustments for age at baseline, smoking status and history of hypertension using a Cox hazard model or Fine and Gray competing risks regression model. The mortality risk ratios of rice Cd concentration (+0.1 ppm) for all causes in women were significantly increased (risk ratio: 1.04). Furthermore, the relative risks of rice Cd concentration for kidney and urinary tract disease, renal diseases, renal failure and toxic effects of cadmium were significantly increased in both sexes. These findings indicated that increased rice Cd concentration decreased the prognosis for life over a long‐term observation in women. This result provides important information for determining the worldwide standard for allowable rice Cd concentration.