condition mean min max ZT0-3 26.6 26.6 26.6 ZT4-7 4.3 4.3 4.3 ZT8-11 3.0999999999999996 3.0999999999999996 3.0999999999999996 ZT12-15 8.55 8.55 8.55 ZT16-19 4.9 4.9 4.9 ZT20-23 20.799999999999997 20.799999999999997 20.799999999999997