condition mean min max ZT0-3 36.650000000000006 36.650000000000006 36.650000000000006 ZT4-7 32.9 32.9 32.9 ZT8-11 20.9 20.9 20.9 ZT12-15 49.55 49.55 49.55 ZT16-19 32.55 32.55 32.55 ZT20-23 32.25 32.25 32.25