condition mean min max ZT0-3 1.3392422314999999 0.303054526 2.375429937 ZT4-7 2.5923140705 2.5206169273333336 2.6640112136666665 ZT8-11 9.77931532 6.289705404999999 13.268925235000001 ZT12-15 7.3798506968333335 5.560997145 9.198704248666667 ZT16-19 8.0437235705 7.890691489333332 8.196755651666667 ZT20-23 1.711814543 1.41048549 2.013143596