condition mean min max ZT0-3 11.850825 11.348500000000001 12.35315 ZT4-7 9.971354999999999 9.971354999999999 9.971354999999999 ZT8-11 16.010550000000002 16.010550000000002 16.010550000000002 ZT12-15 0 0 0 ZT16-19 16.71115 16.71115 16.71115 ZT20-23 9.06072 9.06072 9.06072