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  Indian J Med Microbiol
 

Figure 1: Decrease in goitre prevalence after salt iodization in the Kangra Valley study (1956-72)22. Prevalence of goiter in 1952 was 40 per cent in all the three zones. In zone B (Control group), intervention (iodized salt) was done in 1962.

Figure 1: Decrease in goitre prevalence after salt iodization in the Kangra Valley study (1956-72)<sup>22</sup>. Prevalence of goiter in 1952 was 40 per cent in all the three zones. In zone B (Control group), intervention (iodized salt) was done in 1962.