condition mean min max ZT0-3 0.44546990000000003 0.29295380000000004 0.597986 ZT4-7 0.697188 0.697188 0.697188 ZT8-11 0.14921800000000002 0.14921800000000002 0.14921800000000002 ZT12-15 0 0 0 ZT16-19 0.783836 0.783836 0.783836 ZT20-23 1.1333405 1.1333405 1.1333405