condition mean min max ZT0-3 27.35 27.35 27.35 ZT4-7 3.4 3.4 3.4 ZT8-11 12.95 12.95 12.95 ZT12-15 31.099999999999998 31.099999999999998 31.099999999999998 ZT16-19 39.05 39.05 39.05 ZT20-23 37.2 37.2 37.2