Methods To conduct a 18-month randomized placebo-controlled intervention trial in 14,000 residents (>3 year-old) in Bijie city of Guizhou province, using NaFeEDTA fortified soy sauce (19.6 mg Fe/100 ml) .

• 方法:在贵州省毕节市海子街镇用双盲安慰剂对照法；在14；000名3岁以上群中进行为期18个月的NaFeEDTA强化酱油(29.；6mg铁/100ml)干预试验。