condition mean min max ZT0-3 25.439416666666666 18.207 38.8224 ZT4-7 26.9801 26.9801 26.9801 ZT8-11 15.20365 15.20365 15.20365 ZT12-15 15.157675 13.5256 16.789749999999998 ZT16-19 12.392399999999999 12.392399999999999 12.392399999999999 ZT20-23 14.132249999999999 14.132249999999999 14.132249999999999