condition mean min max ZT0-3 1.9000000000000001 1.9000000000000001 1.9000000000000001 ZT4-7 3.1 3.1 3.1 ZT8-11 20.8 20.8 20.8 ZT12-15 22.0 22.0 22.0 ZT16-19 26.85 26.85 26.85 ZT20-23 3.1 3.1 3.1