condition mean min max ZT0-3 29.228366666666666 27.73005 30.25835 ZT4-7 25.6368 25.6368 25.6368 ZT8-11 24.76015 24.76015 24.76015 ZT12-15 29.135475 29.05845 29.2125 ZT16-19 25.976950000000002 25.976950000000002 25.976950000000002 ZT20-23 28.559649999999998 28.559649999999998 28.559649999999998