condition mean min max ZT0-3 11.266687 11.266687 11.266687 ZT4-7 11.7346055 11.7346055 11.7346055 ZT8-11 12.5101955 12.5101955 12.5101955 ZT12-15 11.2415795 11.2415795 11.2415795 ZT16-19 11.1854965 11.1854965 11.1854965 ZT20-23 13.8090165 13.8090165 13.8090165