| 2004 | 2008 | 2011 |
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N | 100 | 55 | 100 |
Age (Mean ± SD) a,b
| 3.2 ± 1.6 | 2.8 ± 1.3 | 2.9 ± 1.6 |
Sex c
| Boys, n (%) | 55 (55%) | 26 (47%) | 64 (64%) |
| Girls, n (%) | 45 (45%) | 29 (53%) | 36 (36%) |
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a Arithmetic mean ± Standard deviation.
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b Anova three -sample Fischer test, p = 0.87.
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c Chi-square test: (2004 vs 2008, p = 0.34) (2004 vs 2011, p = 1.68) (2008 vs 2011, p = 0.045).