condition mean min max ZT0-3 4.9358749415 4.648536109 5.2232137739999995 ZT4-7 6.689080808 6.680025844 6.6981357720000005 ZT8-11 13.313265304 8.658813439 17.967717169 ZT12-15 17.69704669 17.662889745 17.731203635 ZT16-19 12.5912981075 12.484871775 12.69772444 ZT20-23 11.5487555425 11.461153294999999 11.63635779