Table 1. Proportion of congenital heart defects in relation to the overall number of echocardiograms in children by time period.
| Year | Overall number of echocardiography (n)a | Pediatric echocardiography (n)b | Pediatric echocardiography (%) | CHD (n)c | CHD (%) |
|---|---|---|---|---|---|
| 2004–2005 | 1,614 | 215 | 13.3 | 54 | 25.1 |
| 2006–2007 | 1,914 | 189 | 9.9 | 61 | 32.3 |
| 2008–2009 | 2,009 | 203 | 10.1 | 55 | 27.1 |
| 2010–2011 | 2,090 | 120 | 5.7 | 28 | 23.3 |
| 2012–2013 | 1,763 | 107 | 6.1 | 29 | 27.1 |
a, p-trend =0.424; b, p-trend =0.072; c, p-trend =0.230 (Cochran-Armitage test). CHD, congenital heart disease.