condition mean min max ZT0-3 9.0 9.0 9.0 ZT4-7 25.2 25.2 25.2 ZT8-11 12.7 12.7 12.7 ZT12-15 39.0 39.0 39.0 ZT16-19 35.0 35.0 35.0 ZT20-23 9.45 9.45 9.45