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 0.06939525 0.0 0.1387905 ZT16-19 0.2847265 0.2847265 0.2847265 ZT20-23 0.070156 0.070156 0.070156