condition mean min max ZT0-3 66.180807 66.180807 66.180807 ZT4-7 61.261531500000004 61.261531500000004 61.261531500000004 ZT8-11 53.671569000000005 53.671569000000005 53.671569000000005 ZT12-15 80.9681095 80.9681095 80.9681095 ZT16-19 81.88494349999999 81.88494349999999 81.88494349999999 ZT20-23 131.2815245 131.2815245 131.2815245