Table 1 Characteristics of the study sample and the subgroup of children with strabismus. Data from the KiGGS Study 2003–2006
Characteristic, % (n) | KiGGS Study sample N = 17,640 | Study sample for analysis (3–17 years) N = 12,989 | Children with strabismus (3–17 years) N = 579 |
|---|---|---|---|
Sex: female | 48.7% (8655) | 48.9% (6346) | 51.5% (298) |
Age: | |||
0–2 years | 13.6% (2805) | – | – |
3–6 years | 21.0% (3875) | 27.5% (3577) | 21.9% (127) |
7–10 years | 21.7% (4148) | 28.6% (3714) | 28.5% (165) |
11–13 years | 17.3% (3076) | 20.5% (2659) | 23.5% (136) |
14–17 years | 26.3% (3736) | 23.4% (3039) | 26.1% (151) |
Sibling: yes | 70.9% (12,506) | 76.8% (9975) | 75.0% (434) |
Day care exclusively | |||
within the family | 22.9% (4037) | 14.0% (1824) | 10.9% (63) |
Residence: rural/small town/ town/city | 17.8% / 27.5% / 29.3% / 25.4% | 23.0% / 26.3% / 28.8% / 21.9% | 22.1% / 29,7% / 30.2% / 18.0% |
Migrant: yes | 17.1% (2590) | 13.2% (1716) | 11.1% (64) |
Socio-economic status: | |||
Low | 27.2% (4794) | 26.8% (3485) | 28.5% (165) |
medium | 45.3% (7997) | 46.9% (6093) | 46.5% (269) |
high | 25.1% (4423) | 25.7% (3340) | 24.3% (141) |
Chronic diseases: yes | 12.6% (2226) | 14.2% (1850) | 24.7% (143) |
Official disability: yes | 2.0% (352) | 2.1% (275) | 6.7% (39) |