condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 3.8 3.8 3.8 ZT8-11 19.25 19.25 19.25 ZT12-15 6.35 6.35 6.35 ZT16-19 24.2 24.2 24.2 ZT20-23 3.7 3.7 3.7