condition mean min max ZT0-3 10.67159 10.67159 10.67159 ZT4-7 16.999499999999998 16.999499999999998 16.999499999999998 ZT8-11 22.931350000000002 22.931350000000002 22.931350000000002 ZT12-15 13.71875 13.71875 13.71875 ZT16-19 7.675784999999999 7.675784999999999 7.675784999999999 ZT20-23 8.736015 8.736015 8.736015