condition mean min max ZT0-3 38.87202888 23.96533232 53.778725439999995 ZT4-7 60.3579628975 58.19059810500001 62.52532769 ZT8-11 32.4352453825 26.41225055 38.458240215000004 ZT12-15 15.664756782000001 9.807308046500001 21.5222055175 ZT16-19 24.691705965 24.570719225 24.812692705 ZT20-23 20.073782612499997 18.00931048 22.138254744999998