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To determine if double-fortified salt improved the haemoglobin levels and productivity of tea pickers, a double-blind, randomized, placebo-controlled trial was conducted on 793 tea pickers. The subjects in the experimental households (n = 385) received salt fortified with iron and iodine, and the subjects in the control households (n = 408) received common unfortified salt. Fingerprick blood analysis for haemoglobin by the cyanmethaemoglobin method was performed three times during a period of one year. The productivity data were also analysed for 450 tea pickers. At the end of the year, their average haemoglobin level had increased from 8.9 to 10.2 g/dl and their corresponding picking average had increased from 24.8 kg to 26.2 kg, which could increase annual tea production by 330 tonnes.

Effects of Salt Fortified with Iron and Iodine on the Haemoglobin Levels and Productivity of Tea Pickers