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vita
2006 Dec 03
4
prop.trend.test issue
I have the clinical study data.
Year 0 Year 3
Retinol (nmol/L) N Mean +-sd Mean +-sd
Vitamin A group 73 1.89+-0.36 2.06+-0.53
Trace group 57 1.83+-0.31 1.78+-0.30
where N is the number of male for the clinical study.
I want to test if the mean serum retinol has increased over 3 years
among subjects in the vitamin A group.
> 1.89+0.36