condition mean min max ZT0-3 16.3 16.3 16.3 ZT4-7 7.3 7.3 7.3 ZT8-11 1.5 1.5 1.5 ZT12-15 19.65 19.65 19.65 ZT16-19 45.6 45.6 45.6 ZT20-23 25.5 25.5 25.5