condition mean min max ZT0-3 43.5 43.5 43.5 ZT4-7 43.3 43.3 43.3 ZT8-11 36.95 36.95 36.95 ZT12-15 56.599999999999994 56.599999999999994 56.599999999999994 ZT16-19 30.2 30.2 30.2 ZT20-23 52.45 52.45 52.45