To examine whether serum levels of lipoprotein(a) [Lp(a)], a potential coronary risk factor, are higher in Caucasian-Americans than in Japanese, a circumstance that would correspond to the higher mortality from coronary heart disease in the United States than in Japan, we analyzed serum Lp(a) levels in 30 nonsmoking men and women aged 47-69 years. Participants were drawn from two population-based samples: rural Japanese living in Akita and Caucasians living in Minneapolis-St. Paul, MN. Geometric mean and median serum Lp(a) concentrations were higher (P < 0.05) in Japanese than in Caucasians for both men (difference in geometric mean = 3.2 mg/dL) and women (difference = 5.3 mg/dL). There was however, no racial difference in the proportion of elevated Lp(a) concentrations (i.e., ≤ 30 mg/dL) in either sex. Alcohol intake was inversely correlated with Lp(a) levels in Japanese men, who had a high average alcohol intake, but not in other sex and racial groups. Serum Lp(a) was nonsignificantly but consistently correlated with plasma fibrinogen and LDL-cholesterol for all sex and radical groups. With adjustment for alcohol intake, LDL-cholesterol, and plasma fibrinogen, the Japanese-Caucasian difference in geometric mean Lp(a) values was even larger for men and was changed for women. Results of the present study do not support the hypothesis that racial differences in Lp(a) concentrations contribute to the higher mortality rate from coronary heart disease in the United States than in Japan.
Bibliographical noteFunding Information:
Thrs studs was supported hy a comtacr from the Japanese Ministry of Educxlon. The ARII: dara wetc collected under Narional Heart, Lung, anJ filood Instirure contract NOI-HC-55019. The authors thank Utako Umemura and Minakcl Ktrdo for assIstaxe in Lp(a) measurements and the following ARK: staff: Carol Summers, Cathetme Burke, Deanna Hotwitz, <:ntmen Woody, Agnes L. Haye>, Ruherta Howell, Jane G. Johnson, Part!-eta F. Martin. Carol DeYoung, JaoI Don, Lowell Hedguist, Ellie Justiniano, Sunny Hattcll, Cat& Shearer, I’dme Grove, May A. Cocodtilli, Valetle Stmx>n. Pam I’hle. H<ung Pharn, Ten Trevino, Maria L. Messi, Val Cres-well, lulita S;rm<rto, Wanda Wttght, Regina Delacy, Delilah Cook, Carolyn Bell, Trte~~ Ctotts, Suzanne Pitlchuty, Debbie Rubin-Williams, Witold Slrrdz;ln, l.,v11s Wijnhctg, and (;cc,tge Wdltams.
- coronary heart disease
- cross-culture comparison