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[R-meta] How to assess the amount of change within group through the percentage change from baseline?

Wolfgang Viechtbauer 
Dear Florencio,

Say x1 and x2 are the variables corresponding to the measurements at baseline and after the treatment and m1 and m2 are the respective means. So you have m1 but what exactly do you mean by 'percentage change'? In other words, do you have the mean of 100(x2-x1)/x1 or do you have 100(m2-m1)/m1? I assume you have the former. If so, then you could just meta-analyze those means directly. In other words, just use:

escalc(measure="MN", mi=mean_of_the_percentage_change_values,
                     sdi=sd_of_the_percentage_change_values,
                     ni=sample_size)

Best,
Wolfgang

Thread (2 messages)

Florencio Sousa How to assess the amount of change within group through the percentage change from baseline? May 19 Wolfgang Viechtbauer How to assess the amount of change within group through the percentage change from baseline? May 23