condition mean min max ZT0-3 265.546974 265.546974 265.546974 ZT4-7 252.66189350000002 252.66189350000002 252.66189350000002 ZT8-11 256.410694 256.410694 256.410694 ZT12-15 276.54551 276.54551 276.54551 ZT16-19 346.001355 346.001355 346.001355 ZT20-23 340.2560185 340.2560185 340.2560185