condition mean min max ZT0-3 12.466025000000002 11.507000000000001 13.42505 ZT4-7 6.34724 6.34724 6.34724 ZT8-11 5.665295 5.665295 5.665295 ZT12-15 0 0 0 ZT16-19 9.5488 9.5488 9.5488 ZT20-23 9.533735 9.533735 9.533735