condition mean min max ZT0-3 58.709583333333335 43.22735 84.58185 ZT4-7 52.5993 52.5993 52.5993 ZT8-11 26.18765 26.18765 26.18765 ZT12-15 19.226300000000002 16.591 21.861600000000003 ZT16-19 13.0244 13.0244 13.0244 ZT20-23 13.34645 13.34645 13.34645