condition mean min max ZT0-3 19.7247 16.61645 22.83295 ZT4-7 24.15145 24.15145 24.15145 ZT8-11 32.910349999999994 32.910349999999994 32.910349999999994 ZT12-15 0 0 0 ZT16-19 32.83655 32.83655 32.83655 ZT20-23 22.842950000000002 22.842950000000002 22.842950000000002