condition mean min max ZT0-3 15.552185 8.687005 23.35005 ZT4-7 43.77945 43.77945 43.77945 ZT8-11 33.053650000000005 33.053650000000005 33.053650000000005 ZT12-15 23.959000000000003 16.3248 31.593200000000003 ZT16-19 8.176825000000001 8.176825000000001 8.176825000000001 ZT20-23 12.34275 12.34275 12.34275