condition mean min max ZT0-3 0.314619 0.314619 0.314619 ZT4-7 0.05286475 0.05286475 0.05286475 ZT8-11 0.1938735 0.1938735 0.1938735 ZT12-15 0.252912 0.252912 0.252912 ZT16-19 0.622959 0.622959 0.622959 ZT20-23 0.3431985 0.3431985 0.3431985