condition mean min max ZT0-3 32.8 32.8 32.8 ZT4-7 23.9 23.9 23.9 ZT8-11 13.25 13.25 13.25 ZT12-15 45.949999999999996 45.949999999999996 45.949999999999996 ZT16-19 42.650000000000006 42.650000000000006 42.650000000000006 ZT20-23 35.5 35.5 35.5