condition mean min max ZT0-3 0.046382 0.0 0.071034 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03256875 0.0 0.0651375 ZT16-19 0.060811 0.060811 0.060811 ZT20-23 0.0 0.0 0.0