condition mean min max ZT0-3 9.773661 9.773661 9.773661 ZT4-7 11.8480955 11.8480955 11.8480955 ZT8-11 13.1036675 13.1036675 13.1036675 ZT12-15 18.1214815 18.1214815 18.1214815 ZT16-19 29.9039095 29.9039095 29.9039095 ZT20-23 26.3234255 26.3234255 26.3234255