condition mean min max ZT0-3 11.85 11.85 11.85 ZT4-7 13.0 13.0 13.0 ZT8-11 3.9 3.9 3.9 ZT12-15 3.25 3.25 3.25 ZT16-19 28.950000000000003 28.950000000000003 28.950000000000003 ZT20-23 3.3 3.3 3.3