condition mean min max ZT0-3 67.78666666666666 58.06405 81.22485 ZT4-7 57.8981 57.8981 57.8981 ZT8-11 47.1933 47.1933 47.1933 ZT12-15 46.989975 43.69865 50.2813 ZT16-19 43.390649999999994 43.390649999999994 43.390649999999994 ZT20-23 52.32515 52.32515 52.32515