condition mean min max ZT0-3 9.35 9.35 9.35 ZT4-7 1.5 1.5 1.5 ZT8-11 9.850000000000001 9.850000000000001 9.850000000000001 ZT12-15 1.95 1.95 1.95 ZT16-19 3.5 3.5 3.5 ZT20-23 1.2 1.2 1.2