condition mean min max ZT0-3 87.54515128 77.35219966 97.7381029 ZT4-7 65.90241039 65.40302306000001 66.40179772 ZT8-11 84.627767025 71.47122023 97.78431382 ZT12-15 80.0154800075 68.64112295000001 91.389837065 ZT16-19 91.032962125 87.89373931 94.17218494 ZT20-23 97.90230400499999 93.68578160999999 102.1188264