condition mean min max ZT0-3 9.138912 9.138912 9.138912 ZT4-7 10.630474 10.630474 10.630474 ZT8-11 9.1705875 9.1705875 9.1705875 ZT12-15 10.301800499999999 10.301800499999999 10.301800499999999 ZT16-19 9.6696765 9.6696765 9.6696765 ZT20-23 8.6522805 8.6522805 8.6522805