condition mean min max ZT0-3 6.1145 6.1145 6.1145 ZT4-7 2.817235 2.817235 2.817235 ZT8-11 0.5673075000000001 0.5673075000000001 0.5673075000000001 ZT12-15 1.59071 1.59071 1.59071 ZT16-19 3.4599800000000003 3.4599800000000003 3.4599800000000003 ZT20-23 3.824115 3.824115 3.824115