condition mean min max ZT0-3 268.325074 268.325074 268.325074 ZT4-7 235.2811185 235.2811185 235.2811185 ZT8-11 184.736883 184.736883 184.736883 ZT12-15 126.425411 126.425411 126.425411 ZT16-19 104.349108 104.349108 104.349108 ZT20-23 86.81062750000001 86.81062750000001 86.81062750000001