condition mean min max ZT0-3 16.55 16.55 16.55 ZT4-7 28.4 28.4 28.4 ZT8-11 17.05 17.05 17.05 ZT12-15 11.8 11.8 11.8 ZT16-19 24.95 24.95 24.95 ZT20-23 17.35 17.35 17.35