condition mean min max ZT0-3 0.62774025 0.44146250000000004 0.814018 ZT4-7 0.4837135 0.4837135 0.4837135 ZT8-11 0.5095625 0.5095625 0.5095625 ZT12-15 0 0 0 ZT16-19 1.0038200000000002 1.0038200000000002 1.0038200000000002 ZT20-23 0.736429 0.736429 0.736429