condition mean min max ZT0-3 30.7661 30.7661 30.7661 ZT4-7 18.15685 18.15685 18.15685 ZT8-11 13.66245 13.66245 13.66245 ZT12-15 31.137050000000002 31.137050000000002 31.137050000000002 ZT16-19 38.196650000000005 38.196650000000005 38.196650000000005 ZT20-23 39.17585 39.17585 39.17585