condition mean min max ZT0-3 1.9023500000000002 1.609755 2.194945 ZT4-7 1.1698505 1.1698505 1.1698505 ZT8-11 3.211285 3.211285 3.211285 ZT12-15 0 0 0 ZT16-19 3.690385 3.690385 3.690385 ZT20-23 2.590235 2.590235 2.590235