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Figure 2 The incidence of congenital heart disease (CHD) per 1,000 live births is plotted against the final year of the study (left) and against the percentage of ventricular septal defects (VSDs) (right). In the center, the percentage of VSDs is plotted against the final year of the study. The horizontal lines are drawn arbitrarily at an incidence of 10/1,000 live births and 40% of all CHD, and the vertical lines are drawn arbitrarily at 1985 and 40%, respectively. An increasing proportion of the high incidences are beyond 1985 and for series that have over 40% VSDs.
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