condition mean min max ZT0-3 3.5999999999999996 3.5999999999999996 3.5999999999999996 ZT4-7 22.9 22.9 22.9 ZT8-11 36.9 36.9 36.9 ZT12-15 1.7 1.7 1.7 ZT16-19 3.2 3.2 3.2 ZT20-23 12.65 12.65 12.65