condition mean min max ZT0-3 24.85 24.85 24.85 ZT4-7 29.9 29.9 29.9 ZT8-11 16.0 16.0 16.0 ZT12-15 43.5 43.5 43.5 ZT16-19 25.599999999999998 25.599999999999998 25.599999999999998 ZT20-23 30.799999999999997 30.799999999999997 30.799999999999997