condition mean min max ZT0-3 2.4209075 1.87269 2.969125 ZT4-7 2.825675 2.825675 2.825675 ZT8-11 2.48325 2.48325 2.48325 ZT12-15 0 0 0 ZT16-19 2.92546 2.92546 2.92546 ZT20-23 3.39816 3.39816 3.39816