condition mean min max ZT0-3 5.004255000000001 2.106595 6.585235000000001 ZT4-7 1.502955 1.502955 1.502955 ZT8-11 2.1770050000000003 2.1770050000000003 2.1770050000000003 ZT12-15 4.2442425 4.21861 4.269875000000001 ZT16-19 5.05443 5.05443 5.05443 ZT20-23 7.940754999999999 7.940754999999999 7.940754999999999