condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.02971385 0.02971385 0.02971385 ZT8-11 0.0091788 0.0091788 0.0091788 ZT12-15 0.0099523 0.0099523 0.0099523 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0