condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0741453 0.0741453 0.0741453 ZT12-15 0.020336716666666668 0.0 0.040673433333333335 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0317162 0.0317162 0.0317162