condition mean min max ZT0-3 52.324295 52.324295 52.324295 ZT4-7 29.271671 29.271671 29.271671 ZT8-11 35.0573285 35.0573285 35.0573285 ZT12-15 68.579906 68.579906 68.579906 ZT16-19 73.41784799999999 73.41784799999999 73.41784799999999 ZT20-23 118.4928985 118.4928985 118.4928985