condition mean min max ZT0-3 5.5 5.5 5.5 ZT4-7 0.7 0.7 0.7 ZT8-11 14.850000000000001 14.850000000000001 14.850000000000001 ZT12-15 21.25 21.25 21.25 ZT16-19 12.65 12.65 12.65 ZT20-23 4.95 4.95 4.95