condition mean min max ZT0-3 14.85 14.85 14.85 ZT4-7 30.0 30.0 30.0 ZT8-11 28.8 28.8 28.8 ZT12-15 35.0 35.0 35.0 ZT16-19 31.6 31.6 31.6 ZT20-23 11.45 11.45 11.45