condition mean min max ZT0-3 1.454005 0.735925 2.34302 ZT4-7 3.867325 3.867325 3.867325 ZT8-11 1.457505 1.457505 1.457505 ZT12-15 2.1548001826042498 3.652085e-07 4.3096 ZT16-19 1.274665 1.274665 1.274665 ZT20-23 4.397655 4.397655 4.397655