condition mean min max ZT0-3 7.0 7.0 7.0 ZT4-7 16.7 16.7 16.7 ZT8-11 3.15 3.15 3.15 ZT12-15 4.65 4.65 4.65 ZT16-19 51.7 51.7 51.7 ZT20-23 18.95 18.95 18.95