condition mean min max ZT0-3 1.102267 1.0183265000000001 1.1862075 ZT4-7 2.30846 2.30846 2.30846 ZT8-11 3.0571200000000003 3.0571200000000003 3.0571200000000003 ZT12-15 0 0 0 ZT16-19 1.8774000000000002 1.8774000000000002 1.8774000000000002 ZT20-23 1.88577 1.88577 1.88577