condition mean min max ZT0-3 10.455672 10.455672 10.455672 ZT4-7 11.533576499999999 11.533576499999999 11.533576499999999 ZT8-11 10.603577000000001 10.603577000000001 10.603577000000001 ZT12-15 9.5924855 9.5924855 9.5924855 ZT16-19 10.851874500000001 10.851874500000001 10.851874500000001 ZT20-23 10.5170095 10.5170095 10.5170095