condition mean min max ZT0-3 8.706824 8.706824 8.706824 ZT4-7 10.1098015 10.1098015 10.1098015 ZT8-11 9.054817499999999 9.054817499999999 9.054817499999999 ZT12-15 8.8166735 8.8166735 8.8166735 ZT16-19 8.8263 8.8263 8.8263 ZT20-23 8.969805000000001 8.969805000000001 8.969805000000001