condition mean min max ZT0-3 9.5 9.5 9.5 ZT4-7 12.4 12.4 12.4 ZT8-11 4.8 4.8 4.8 ZT12-15 4.1 4.1 4.1 ZT16-19 5.55 5.55 5.55 ZT20-23 12.7 12.7 12.7