condition mean min max ZT0-3 51.32475 51.32475 51.32475 ZT4-7 44.2157 44.2157 44.2157 ZT8-11 41.695800000000006 41.695800000000006 41.695800000000006 ZT12-15 46.58995 46.58995 46.58995 ZT16-19 58.566050000000004 58.566050000000004 58.566050000000004 ZT20-23 52.96125 52.96125 52.96125