condition mean min max ZT0-3 73.444559 73.444559 73.444559 ZT4-7 48.9795695 48.9795695 48.9795695 ZT8-11 58.657792 58.657792 58.657792 ZT12-15 71.03657749999999 71.03657749999999 71.03657749999999 ZT16-19 66.01924 66.01924 66.01924 ZT20-23 66.699881 66.699881 66.699881