Table 1 Demographic characteristics of the study populations
Characteristics | 2009 | 2010 | 2010 | 2012 | 2013 | 2014 | 2015 | 2016 |
|---|---|---|---|---|---|---|---|---|
Patients (n) | 274,202 | 283,224 | 287,155 | 278,234 | 270,348 | 273,276 | 265,922 | 262,766 |
Sex (%) | ||||||||
boys | 69.5 | 69.6 | 69.5 | 70.9 | 73.0 | 73.3 | 74.3 | 74.3 |
girls | 20.1 | 20.7 | 21.1 | 21.7 | 22.5 | 23.2 | 23.9 | 24.1 |
unknown | 10.3 | 9.7 | 9.4 | 7.3 | 4.5 | 3.5 | 1.8 | 1.5 |
Age groups (%) | ||||||||
5–6 | 6.5 | 6.5 | 6.1 | 5.9 | 5.8 | 6.7 | 6.6 | 6.5 |
7–8 | 17.7 | 17.1 | 16.7 | 16.4 | 16.1 | 16.3 | 16.8 | 17.2 |
9–10 | 27.4 | 26.9 | 26.1 | 25.7 | 25.4 | 25.3 | 25.2 | 25.4 |
11–12 | 26.9 | 26.9 | 27.4 | 27.5 | 27.1 | 26.5 | 26.5 | 26.4 |
13–14 | 21.5 | 22.6 | 23.6 | 24.5 | 25.5 | 25.2 | 24.9 | 24.5 |