condition mean min max ZT0-3 32.400000000000006 32.400000000000006 32.400000000000006 ZT4-7 18.4 18.4 18.4 ZT8-11 33.65 33.65 33.65 ZT12-15 12.649999999999999 12.649999999999999 12.649999999999999 ZT16-19 16.35 16.35 16.35 ZT20-23 20.75 20.75 20.75