condition mean min max ZT0-3 16.5 16.5 16.5 ZT4-7 7.1 7.1 7.1 ZT8-11 19.3 19.3 19.3 ZT12-15 22.45 22.45 22.45 ZT16-19 12.45 12.45 12.45 ZT20-23 5.0 5.0 5.0