condition mean min max ZT0-3 5.2 5.2 5.2 ZT4-7 2.6 2.6 2.6 ZT8-11 2.65 2.65 2.65 ZT12-15 2.55 2.55 2.55 ZT16-19 34.15 34.15 34.15 ZT20-23 1.7999999999999998 1.7999999999999998 1.7999999999999998