condition mean min max ZT0-3 0.296259474 0.179667562 0.41285138600000004 ZT4-7 0.9654468692500001 0.5880186855 1.3428750530000002 ZT8-11 1.808027471 1.6483152909999998 1.967739651 ZT12-15 6.5660209035 4.3591953835 8.772846423499999 ZT16-19 9.09756605675 6.638752103 11.5563800105 ZT20-23 20.958387095 17.219154075 24.697620115