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Figure 8 Graph comparing event-free rates after successful device implantation. This was done so as to assess difference, if any, following first, second and third generation versus fourth generation buttoned device occlusion of secundum atrial septal defects. The fourth generation (Gen) data are depicted by filled squares and the first, second and third generation by unfilled squares. The number of subjects available for follow-up at each specified follow-up interval are shown at the bottom of the graph, appropriately keyed. Note that there is no difference (p > 0.1) by log-rank test between the two cohorts.
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