condition mean min max ZT0-3 32.39795 32.39795 32.39795 ZT4-7 31.676949999999998 31.676949999999998 31.676949999999998 ZT8-11 22.11515 22.11515 22.11515 ZT12-15 20.0826 20.0826 20.0826 ZT16-19 21.96535 21.96535 21.96535 ZT20-23 27.9561 27.9561 27.9561