condition mean min max ZT0-3 354.774319 354.774319 354.774319 ZT4-7 343.929167 343.929167 343.929167 ZT8-11 401.4269475 401.4269475 401.4269475 ZT12-15 376.63919050000004 376.63919050000004 376.63919050000004 ZT16-19 508.2379955 508.2379955 508.2379955 ZT20-23 484.77585150000004 484.77585150000004 484.77585150000004