condition mean min max ZT0-3 12.8 12.8 12.8 ZT4-7 54.8 54.8 54.8 ZT8-11 29.7 29.7 29.7 ZT12-15 22.65 22.65 22.65 ZT16-19 15.05 15.05 15.05 ZT20-23 33.349999999999994 33.349999999999994 33.349999999999994