Test for significance

Hi there,

I am comparing food intake in rural and urban areas. I want to test if there is a significant difference in the intake of specific foodgroups based on the number of observations (number of household who consumed the specific group). Ive used t.test two calculate if there is a significant difference, but can I also use this test to test the difference between the intake of specifik groups e.g. if 13 and 15 are significantly different?

food rural hh urban hh
Dark green leafy vegetables 13 15
Starchy foods 4 44
x y z
x y z

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