condition mean min max ZT0-3 1.2514066666666668 0.0 3.75422 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 1.751265 0.0 3.50253 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0