condition mean min max ZT0-3 0.014991237 0.0 0.029982474 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0271689695 0.016440497333333335 0.03789744166666666 ZT20-23 0.0 0.0 0.0