condition mean min max ZT0-3 140.776015 140.776015 140.776015 ZT4-7 217.601344 217.601344 217.601344 ZT8-11 299.29310499999997 299.29310499999997 299.29310499999997 ZT12-15 249.1657005 249.1657005 249.1657005 ZT16-19 163.9255205 163.9255205 163.9255205 ZT20-23 155.32689599999998 155.32689599999998 155.32689599999998