condition mean min max ZT0-3 0.12524317499999998 0.058406349999999996 0.19208 ZT4-7 0.1936475 0.1936475 0.1936475 ZT8-11 0.429363 0.429363 0.429363 ZT12-15 0 0 0 ZT16-19 0.382641 0.382641 0.382641 ZT20-23 0.32719050000000005 0.32719050000000005 0.32719050000000005