condition mean min max ZT0-3 10.3720775 9.884855 10.8593 ZT4-7 8.461635000000001 8.461635000000001 8.461635000000001 ZT8-11 4.745485 4.745485 4.745485 ZT12-15 0 0 0 ZT16-19 5.606695 5.606695 5.606695 ZT20-23 8.33573 8.33573 8.33573