condition mean min max ZT0-3 16.5 16.5 16.5 ZT4-7 24.7 24.7 24.7 ZT8-11 26.7 26.7 26.7 ZT12-15 22.35 22.35 22.35 ZT16-19 12.7 12.7 12.7 ZT20-23 22.1 22.1 22.1