condition mean min max ZT0-3 17.4339 17.4339 17.4339 ZT4-7 18.54515 18.54515 18.54515 ZT8-11 15.314149999999998 15.314149999999998 15.314149999999998 ZT12-15 16.60985 16.60985 16.60985 ZT16-19 24.6386 24.6386 24.6386 ZT20-23 15.837 15.837 15.837