condition mean min max ZT0-3 5.915743333333333 5.915743333333333 5.915743333333333 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 2.86558 2.86558 2.86558 ZT16-19 2.3122000000000003 2.3122000000000003 2.3122000000000003 ZT20-23 3.4671000000000003 3.4671000000000003 3.4671000000000003