condition mean min max ZT0-3 40.81278333333333 27.66235 48.125249999999994 ZT4-7 21.6158 21.6158 21.6158 ZT8-11 20.7723 20.7723 20.7723 ZT12-15 25.466974999999998 24.06825 26.8657 ZT16-19 30.8734 30.8734 30.8734 ZT20-23 53.714 53.714 53.714