condition mean min max ZT0-3 44.37705 42.10105 46.65305 ZT4-7 29.04405 29.04405 29.04405 ZT8-11 24.781550000000003 24.781550000000003 24.781550000000003 ZT12-15 0 0 0 ZT16-19 34.09685 34.09685 34.09685 ZT20-23 35.567899999999995 35.567899999999995 35.567899999999995