condition mean min max ZT0-3 5.9715277785000005 2.379724768 9.563330789 ZT4-7 14.863912452500001 14.481556205 15.246268700000002 ZT8-11 11.323913774000001 10.676736753 11.971090795 ZT12-15 10.69657671275 9.959492334 11.4336610915 ZT16-19 15.805836280000001 14.311809705000002 17.299862855 ZT20-23 19.3876968725 18.811343195 19.96405055