condition mean min max ZT0-3 6.94703 6.294145 7.599915 ZT4-7 4.370485 4.370485 4.370485 ZT8-11 6.45847 6.45847 6.45847 ZT12-15 0 0 0 ZT16-19 7.376635 7.376635 7.376635 ZT20-23 5.798265000000001 5.798265000000001 5.798265000000001