condition mean min max ZT0-3 22.8 22.8 22.8 ZT4-7 22.5 22.5 22.5 ZT8-11 3.0 3.0 3.0 ZT12-15 43.0 43.0 43.0 ZT16-19 29.950000000000003 29.950000000000003 29.950000000000003 ZT20-23 18.9 18.9 18.9