condition mean min max ZT0-3 28.55 28.55 28.55 ZT4-7 25.9 25.9 25.9 ZT8-11 35.0 35.0 35.0 ZT12-15 30.85 30.85 30.85 ZT16-19 29.049999999999997 29.049999999999997 29.049999999999997 ZT20-23 41.849999999999994 41.849999999999994 41.849999999999994