condition mean min max ZT0-3 18.320999999999998 18.320999999999998 18.320999999999998 ZT4-7 17.3435 17.3435 17.3435 ZT8-11 10.6207 10.6207 10.6207 ZT12-15 5.4374400000000005 5.4374400000000005 5.4374400000000005 ZT16-19 3.743295 3.743295 3.743295 ZT20-23 9.3989 9.3989 9.3989