condition mean min max ZT0-3 0.0107281 0.0107281 0.0107281 ZT4-7 0.01257115 0.01257115 0.01257115 ZT8-11 0.0101851 0.0101851 0.0101851 ZT12-15 0.0454394 0.0454394 0.0454394 ZT16-19 0.0 0.0 0.0 ZT20-23 0.01634555 0.01634555 0.01634555