condition mean min max ZT0-3 508.245006 508.245006 508.245006 ZT4-7 369.61922300000003 369.61922300000003 369.61922300000003 ZT8-11 333.101967 333.101967 333.101967 ZT12-15 348.7139985 348.7139985 348.7139985 ZT16-19 376.96633699999995 376.96633699999995 376.96633699999995 ZT20-23 414.6127715 414.6127715 414.6127715