condition mean min max ZT0-3 5.0 5.0 5.0 ZT4-7 3.3 3.3 3.3 ZT8-11 19.05 19.05 19.05 ZT12-15 11.15 11.15 11.15 ZT16-19 16.4 16.4 16.4 ZT20-23 2.9 2.9 2.9