Bailey L B, Wagner P A, Davis C G, Dinning J S
J Am Diet Assoc. 1984 Jul;84(7):801-4.
Food frequency data for 372 adolescents from urban and rural low-income households were evaluated. The urban group consisted of blacks (N = 161) and Hispanics (N = 32); blacks (N = 58) and whites (N = 121) composed the rural group. A food frequency questionnaire with 24 food groups categorized according to nutrient contribution was completed for each subject by a trained interviewer. Urban blacks selected folacin-dense foods more frequently than urban Hispanics or rural blacks. This difference corresponded with a higher prevalence of poor folacin status in urban Hispanics vs. urban blacks and in rural blacks vs. urban blacks. Rural whites also consumed a higher frequency of folacin-dense food groups than rural blacks, which, again, corresponded with differences in folacin status. The infrequent consumption of vegetables and fruits, particularly by rural black and urban Hispanic adolescents, provides an explanation for the poor folacin status of the adolescents.
对来自城市和农村低收入家庭的372名青少年的食物频率数据进行了评估。城市组包括黑人（N = 161）和西班牙裔（N = 32）；农村组由黑人（N = 58）和白人（N = 121）组成。一名经过培训的访谈员为每个受试者完成了一份食物频率问卷，该问卷将24个食物组按照营养贡献进行了分类。城市黑人比城市西班牙裔或农村黑人更频繁地选择富含叶酸的食物。这种差异与城市西班牙裔与城市黑人以及农村黑人与城市黑人相比叶酸状态较差的患病率较高相对应。农村白人也比农村黑人更频繁地食用富含叶酸的食物组，这同样与叶酸状态的差异相对应。蔬菜和水果摄入频率低，尤其是农村黑人和城市西班牙裔青少年，这为青少年叶酸状态不佳提供了解释。
