condition mean min max ZT0-3 628.937811 628.937811 628.937811 ZT4-7 686.2765855 686.2765855 686.2765855 ZT8-11 695.5398715 695.5398715 695.5398715 ZT12-15 502.2072945 502.2072945 502.2072945 ZT16-19 513.10235 513.10235 513.10235 ZT20-23 517.6505709999999 517.6505709999999 517.6505709999999