condition mean min max ZT0-3 8.886800000000001 8.886800000000001 8.886800000000001 ZT4-7 4.29915 4.29915 4.29915 ZT8-11 22.64595 22.64595 22.64595 ZT12-15 48.4821 48.4821 48.4821 ZT16-19 19.73635 19.73635 19.73635 ZT20-23 22.9623 22.9623 22.9623