condition mean min max ZT0-3 20.049999999999997 20.049999999999997 20.049999999999997 ZT4-7 13.3 13.3 13.3 ZT8-11 46.8 46.8 46.8 ZT12-15 24.85 24.85 24.85 ZT16-19 59.8 59.8 59.8 ZT20-23 24.799999999999997 24.799999999999997 24.799999999999997