condition mean min max ZT0-3 2257.005409 2257.005409 2257.005409 ZT4-7 506.962826 506.962826 506.962826 ZT8-11 400.940419 400.940419 400.940419 ZT12-15 587.770668 587.770668 587.770668 ZT16-19 2037.693595 2037.693595 2037.693595 ZT20-23 2678.9561009999998 2678.9561009999998 2678.9561009999998