condition mean min max ZT0-3 66.05265 66.05265 66.05265 ZT4-7 56.6496 56.6496 56.6496 ZT8-11 38.062799999999996 38.062799999999996 38.062799999999996 ZT12-15 38.69915 38.69915 38.69915 ZT16-19 48.90545 48.90545 48.90545 ZT20-23 70.471 70.471 70.471