condition mean min max ZT0-3 1.7999999999999998 1.7999999999999998 1.7999999999999998 ZT4-7 1.1 1.1 1.1 ZT8-11 1.65 1.65 1.65 ZT12-15 1.75 1.75 1.75 ZT16-19 5.95 5.95 5.95 ZT20-23 2.5 2.5 2.5