condition mean min max ZT0-3 64.442697 64.442697 64.442697 ZT4-7 34.079113 34.079113 34.079113 ZT8-11 39.3559855 39.3559855 39.3559855 ZT12-15 39.4640795 39.4640795 39.4640795 ZT16-19 75.86232799999999 75.86232799999999 75.86232799999999 ZT20-23 105.085129 105.085129 105.085129