condition mean min max ZT0-3 97.23267 97.23267 97.23267 ZT4-7 56.465043 56.465043 56.465043 ZT8-11 52.2075945 52.2075945 52.2075945 ZT12-15 65.99237049999999 65.99237049999999 65.99237049999999 ZT16-19 36.965644999999995 36.965644999999995 36.965644999999995 ZT20-23 40.021016 40.021016 40.021016