condition mean min max ZT0-3 5.313134166666666 1.0005975 7.95252 ZT4-7 0.719051 0.719051 0.719051 ZT8-11 0.762765 0.762765 0.762765 ZT12-15 11.7497925 7.548885 15.9507 ZT16-19 8.681905 8.681905 8.681905 ZT20-23 9.637785000000001 9.637785000000001 9.637785000000001