condition mean min max ZT0-3 12.248888889 12.248888889 12.248888889 ZT4-7 24.52611111 24.52611111 24.52611111 ZT8-11 10.552222219999999 10.552222219999999 10.552222219999999 ZT12-15 6.411111110999999 6.411111110999999 6.411111110999999 ZT16-19 5.467777778 5.467777778 5.467777778 ZT20-23 5.38 5.38 5.38