A matched-pairs case-control study is conducted. Each case (a person with disease X) is matched to a single control, based on age (plus or minus 2 years) and gender. Each person is then asked if...

A matched-pairs case-control study is conducted. Each case (a person with disease X) is matched to a single control, based on age (plus or minus 2 years) and gender. Each person is then asked if he/she used multivitamins regularly in the past year. The results are:

Remembering that this is a matched study, compute a McNamara chi-square. Are the cases more or less likely to have used vitamins?