condition mean min max ZT0-3 41.268699999999995 41.268699999999995 41.268699999999995 ZT4-7 35.31435 35.31435 35.31435 ZT8-11 28.039099999999998 28.039099999999998 28.039099999999998 ZT12-15 32.485699999999994 32.485699999999994 32.485699999999994 ZT16-19 37.0136 37.0136 37.0136 ZT20-23 42.2668 42.2668 42.2668