condition mean min max ZT0-3 73.6 73.6 73.6 ZT4-7 86.7 86.7 86.7 ZT8-11 70.25 70.25 70.25 ZT12-15 29.799999999999997 29.799999999999997 29.799999999999997 ZT16-19 30.85 30.85 30.85 ZT20-23 37.1 37.1 37.1