condition mean min max ZT0-3 2551.85 2551.85 2551.85 ZT4-7 2567.5 2567.5 2567.5 ZT8-11 2361.7 2361.7 2361.7 ZT12-15 1993.4 1993.4 1993.4 ZT16-19 2072.3 2072.3 2072.3 ZT20-23 1926.8 1926.8 1926.8