In this group, the deficient rate of riboflavin reached 42.9%, the rate of iron deficient anaemia was 37.5% and the abnormal rate of free erythrocyte protoporphyrin (FEP) was 11.0%.

• 发现：其核黄素缺乏率为42.；9%25（30/70），缺铁性贫血率为37