A 30-year trend of dairy consumption and its determinants among income groups in Iranian households.

In terms of yogurt consumption, there was a decreasing trend until 1996, followed by a slight increase up to 2004 in the 1st and 2nd tertiles and up to 2005 in the 3rd tertile.

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There has been an increasing trend since then, until 2012, when a decrease started and has continued since then.

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