condition mean min max ZT0-3 7.48822 7.48822 7.48822 ZT4-7 4.54868 4.54868 4.54868 ZT8-11 2.892835 2.892835 2.892835 ZT12-15 6.764265 6.764265 6.764265 ZT16-19 10.418975 10.418975 10.418975 ZT20-23 9.37299 9.37299 9.37299