condition mean min max ZT0-3 37.349999999999994 37.349999999999994 37.349999999999994 ZT4-7 26.9 26.9 26.9 ZT8-11 26.85 26.85 26.85 ZT12-15 29.05 29.05 29.05 ZT16-19 16.7 16.7 16.7 ZT20-23 30.0 30.0 30.0