condition mean min max ZT0-3 12.255825 11.8062 12.705449999999999 ZT4-7 11.36785 11.36785 11.36785 ZT8-11 10.499614999999999 10.499614999999999 10.499614999999999 ZT12-15 0 0 0 ZT16-19 13.666 13.666 13.666 ZT20-23 13.4561 13.4561 13.4561