condition mean min max ZT0-3 16.3 16.3 16.3 ZT4-7 8.4 8.4 8.4 ZT8-11 16.7 16.7 16.7 ZT12-15 40.35 40.35 40.35 ZT16-19 32.9 32.9 32.9 ZT20-23 18.8 18.8 18.8