condition mean min max ZT0-3 3.22575 3.215485 3.236015 ZT4-7 3.49411 3.49411 3.49411 ZT8-11 2.31246 2.31246 2.31246 ZT12-15 0 0 0 ZT16-19 4.399205 4.399205 4.399205 ZT20-23 2.208945 2.208945 2.208945