condition mean min max ZT0-3 192.278668 192.278668 192.278668 ZT4-7 140.08094749999998 140.08094749999998 140.08094749999998 ZT8-11 126.82352599999999 126.82352599999999 126.82352599999999 ZT12-15 186.32101749999998 186.32101749999998 186.32101749999998 ZT16-19 161.9609425 161.9609425 161.9609425 ZT20-23 180.46721250000002 180.46721250000002 180.46721250000002