condition mean min max ZT0-3 0.35336166750000003 0.0 0.7067233350000001 ZT4-7 5.23260218725 4.1949521875 6.2702521870000005 ZT8-11 4.3527819915 3.5820388495000004 5.123525133499999 ZT12-15 4.0415179405 4.0117993485 4.0712365325 ZT16-19 8.886352019 8.037831179000001 9.734872859 ZT20-23 8.517713832999998 7.690904154 9.344523511999999