condition mean min max ZT0-3 180.38166666666666 150.83499999999998 237.45499999999998 ZT4-7 195.6645 195.6645 195.6645 ZT8-11 96.54925 96.54925 96.54925 ZT12-15 36.88315 32.9501 40.816199999999995 ZT16-19 22.935299999999998 22.935299999999998 22.935299999999998 ZT20-23 51.49315 51.49315 51.49315