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?

Example:
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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