I tried to go a little further since the depression study seemed to be focused on total brain matter. I might make a mistake here, but... Grey matter is about

I tried to go a little further since the depression study seemed to be focused on total brain matter. I might make a mistake here, but... Grey matter is about 40% of the brain, white matter is 60%, so if we're talking about absolute matter, we should factor that in. For 0 to 3 drinks: GMV: -0.380 x 0.4 = -0.152 SD WMV: -0.223 x 0.6 = -0.1338 SD Should be sum of 0.2858 standard deviations of total brain matter, or about 2.5% reduction. For 0 to 2 drinks: GMV: -0.157 x 0.4 = -0.0628 SD WMV: -0.094 x 0.6 = -0.0564 SD 0.1192 SD or about 1.05% reduction