condition mean min max ZT0-3 8.812665 8.812665 8.812665 ZT4-7 10.386682 10.386682 10.386682 ZT8-11 10.5645115 10.5645115 10.5645115 ZT12-15 10.3752785 10.3752785 10.3752785 ZT16-19 10.6801085 10.6801085 10.6801085 ZT20-23 10.1471145 10.1471145 10.1471145