condition mean min max ZT0-3 33.099999999999994 33.099999999999994 33.099999999999994 ZT4-7 43.9 43.9 43.9 ZT8-11 33.2 33.2 33.2 ZT12-15 27.85 27.85 27.85 ZT16-19 32.15 32.15 32.15 ZT20-23 18.3 18.3 18.3