condition mean min max ZT0-3 188.686107 188.686107 188.686107 ZT4-7 152.7867385 152.7867385 152.7867385 ZT8-11 141.03269899999998 141.03269899999998 141.03269899999998 ZT12-15 171.9599125 171.9599125 171.9599125 ZT16-19 167.5015205 167.5015205 167.5015205 ZT20-23 113.637693 113.637693 113.637693