condition mean min max ZT0-3 36.75893333333333 33.35835 40.344899999999996 ZT4-7 30.56635 30.56635 30.56635 ZT8-11 27.2949 27.2949 27.2949 ZT12-15 35.009975 29.5978 40.42215 ZT16-19 31.72605 31.72605 31.72605 ZT20-23 46.66115 46.66115 46.66115