condition mean min max ZT0-3 67.5398 55.26365 92.07335 ZT4-7 58.1797 58.1797 58.1797 ZT8-11 38.488299999999995 38.488299999999995 38.488299999999995 ZT12-15 49.16120000000001 29.891150000000003 68.43125 ZT16-19 20.219099999999997 20.219099999999997 20.219099999999997 ZT20-23 34.22085 34.22085 34.22085