condition mean min max ZT0-3 24.8 24.8 24.8 ZT4-7 4.6 4.6 4.6 ZT8-11 7.45 7.45 7.45 ZT12-15 21.05 21.05 21.05 ZT16-19 19.15 19.15 19.15 ZT20-23 5.0 5.0 5.0