condition mean min max ZT0-3 21.95 21.95 21.95 ZT4-7 40.6 40.6 40.6 ZT8-11 43.5 43.5 43.5 ZT12-15 46.5 46.5 46.5 ZT16-19 72.75 72.75 72.75 ZT20-23 60.400000000000006 60.400000000000006 60.400000000000006