condition mean min max ZT0-3 0.7117688333333333 0.423081 0.9504495 ZT4-7 0.348728 0.348728 0.348728 ZT8-11 0.22811599999999999 0.22811599999999999 0.22811599999999999 ZT12-15 0.335584 0.17172300000000001 0.49944500000000003 ZT16-19 0.46026449999999997 0.46026449999999997 0.46026449999999997 ZT20-23 0.840529 0.840529 0.840529