condition mean min max ZT0-3 50.538342022500004 39.568335625 61.50834842 ZT4-7 13.460831575250001 12.2831410655 14.638522085 ZT8-11 22.1286106525 15.78703823 28.470183075 ZT12-15 20.03032771175 17.210749015 22.8499064085 ZT16-19 15.3962510425 13.832135359999999 16.960366725 ZT20-23 23.097227840000002 22.959178135000002 23.235277545000002