How to generate mean by group under special circumstance?

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Generating the mean of the variable like :

bys id: egen vari_mean= mean(vari).

And I have six years data. (1956 1957 1958  1959 1960 1961 ).
but I want to generate the mean value of the first three years(1956 1957 1958), so what should I do?
Thank you for your attention.

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关键词：generate Special stance Under Group attention generate special should Thank

use if condition