condition mean min max ZT0-3 8.25 8.25 8.25 ZT4-7 3.0 3.0 3.0 ZT8-11 4.4 4.4 4.4 ZT12-15 14.6 14.6 14.6 ZT16-19 42.15 42.15 42.15 ZT20-23 19.0 19.0 19.0