condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 68.6 68.6 68.6 ZT8-11 50.55 50.55 50.55 ZT12-15 28.35 28.35 28.35 ZT16-19 24.65 24.65 24.65 ZT20-23 16.0 16.0 16.0