condition mean min max ZT0-3 0.161833125 0.10436424999999999 0.219302 ZT4-7 1.3587449999999999 1.3587449999999999 1.3587449999999999 ZT8-11 1.956693 1.956693 1.956693 ZT12-15 0.45679485 0.4465457 0.46704399999999996 ZT16-19 0.43701071666666663 0.23730543333333334 0.636716 ZT20-23 0 0 0