condition mean min max ZT0-3 14.25 14.25 14.25 ZT4-7 2.6 2.6 2.6 ZT8-11 6.5 6.5 6.5 ZT12-15 4.3 4.3 4.3 ZT16-19 20.2 20.2 20.2 ZT20-23 3.55 3.55 3.55