condition mean min max ZT0-3 0.3079235105 0.14496864399999998 0.470878377 ZT4-7 0.9992406570000001 0.882643846 1.115837468 ZT8-11 3.9870515920000003 3.7718035363333335 4.202299647666667 ZT12-15 9.695243633 9.363082791 10.027404475 ZT16-19 3.422016658166667 2.3998554420000002 4.4441778743333336 ZT20-23 1.1985682123333334 1.132913377 1.2642230476666667