condition mean min max ZT0-3 0.4588758333333333 0.253025 0.699866 ZT4-7 1.5682749999999999 1.5682749999999999 1.5682749999999999 ZT8-11 3.0328850000000003 3.0328850000000003 3.0328850000000003 ZT12-15 1.0614325 0.6512249999999999 1.4716399999999998 ZT16-19 0.4609935 0.4609935 0.4609935 ZT20-23 0.252771 0.252771 0.252771