condition mean min max ZT0-3 265.625602 265.625602 265.625602 ZT4-7 289.7447195 289.7447195 289.7447195 ZT8-11 296.7488705 296.7488705 296.7488705 ZT12-15 269.3547765 269.3547765 269.3547765 ZT16-19 277.3989115 277.3989115 277.3989115 ZT20-23 264.95041000000003 264.95041000000003 264.95041000000003