Table 1 Demographic characteristics of the participants in the Haidian District of Beijing, China
Year | N a | Gender (Boys/Girls) (%) |
|---|---|---|
2006 | 3657 | 1742/1915 (47.63/52.37) |
2007 | 3615 | 1720/1895 (47.58/52.42) |
2008 | 3662 | 1728/1934 (47.19/52.81) |
2009 | 3697 | 1833/1864 (49.58/50.42) |
2010 | 3897 | 1853/2044 (47.55/52.45) |
2011 | 3784 | 1926/1858 (50.90/49.10) |
2012 | 3816 | 1752/2064 (45.91/54.09) |
2013 | 3787 | 1816/1971 (47.95/52.05) |
2014 | 3833 | 1783/2050 (46.52/53.48) |
2015 | 3676 | 1772/1904 (48.20 /51.80) |
Total | 37,424 | 17,925/19499 (47.90/52.10) |