condition mean min max ZT0-3 77.191472 77.191472 77.191472 ZT4-7 63.5555135 63.5555135 63.5555135 ZT8-11 64.01245449999999 64.01245449999999 64.01245449999999 ZT12-15 73.3781105 73.3781105 73.3781105 ZT16-19 58.554749 58.554749 58.554749 ZT20-23 63.060323 63.060323 63.060323