condition mean min max ZT0-3 10.6954 10.6954 10.6954 ZT4-7 5.8986350000000005 5.8986350000000005 5.8986350000000005 ZT8-11 8.050485 8.050485 8.050485 ZT12-15 16.94005 16.94005 16.94005 ZT16-19 17.22905 17.22905 17.22905 ZT20-23 12.65805 12.65805 12.65805