condition mean min max ZT0-3 45.3 45.3 45.3 ZT4-7 18.6 18.6 18.6 ZT8-11 18.9 18.9 18.9 ZT12-15 16.2 16.2 16.2 ZT16-19 29.05 29.05 29.05 ZT20-23 43.95 43.95 43.95