condition mean min max ZT0-3 1.378755 1.378755 1.378755 ZT4-7 0.3368265 0.3368265 0.3368265 ZT8-11 1.0038715 1.0038715 1.0038715 ZT12-15 1.8135815000000002 1.8135815000000002 1.8135815000000002 ZT16-19 2.7480700000000002 2.7480700000000002 2.7480700000000002 ZT20-23 1.0313275 1.0313275 1.0313275