condition mean min max ZT0-3 29.98342 29.98342 29.98342 ZT4-7 40.510395 40.510395 40.510395 ZT8-11 27.0287425 27.0287425 27.0287425 ZT12-15 21.0942515 21.0942515 21.0942515 ZT16-19 27.8594785 27.8594785 27.8594785 ZT20-23 28.1768945 28.1768945 28.1768945