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Table 1 Characteristics of the study sample and the subgroup of children with strabismus. Data from the KiGGS Study 2003–2006

From: Health-related quality of life and mental health in children and adolescents with strabismus – results of the representative population-based survey KiGGS

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)