Plasma fibrinogen and its correlates in elderly Japanese men living in Japan and Hawaii

Plasma fibrinogen levels were determined using comparable methods for 329 J apanese men in Hiroshima Japan, and 3571 Japanese-American men in Honolulu Hawaii, aged 71-93 years. The age-adjusted mean fibrinogen level in Japanes e-American men (307 mg/dl) was significantly higher (p < 0.0001) than in na tive Japanese men (270 mg/dl). In multiple linear regression models, the fi brinogen level was associated significantly and positively with white blood cell count (WBC) and total cholesterol, and inversely with HDL cholesterol and hematocrit in both study samples. The strongest association with fibri nogen was shown for WBC, and this association was not mediated through ciga rette smoking. The observed difference in fibrinogen levels could not be fu lly explained by WBC, total and HDL cholesterol, triglyceride, hematocrit, body mass index, and diabetes. Some unmeasured environmental or lifestyle v ariables such as diet and physical activity may be partly responsible for t he observed difference in fibrinogen levels between native Japanese men and Japanese-American men in Hawaii. (C) 1999 Elsevier Science Inc. All rights reserved.