condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.617183 0.401261 0.833105 ZT16-19 0.0 0.0 0.0 ZT20-23 0.360974 0.360974 0.360974