condition mean min max ZT0-3 0.3989505 0.269677 0.528224 ZT4-7 0.2685325 0.2685325 0.2685325 ZT8-11 0.269054 0.269054 0.269054 ZT12-15 0 0 0 ZT16-19 0.353769 0.353769 0.353769 ZT20-23 0.6219745 0.6219745 0.6219745