condition mean min max ZT0-3 7.5002762445 6.64895044 8.351602049 ZT4-7 4.071830806 3.9843435289999998 4.1593180830000005 ZT8-11 2.280048915 1.9183032670000002 2.6417945630000004 ZT12-15 3.9387012335 3.1084270679999997 4.7689753989999994 ZT16-19 4.163400114 3.5007837315000003 4.826016496499999 ZT20-23 7.769107315 6.849761566 8.688453064