1naresh2naresh
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Demographic characteristics of the sample
Total Group (n = 208) (100%)Controls (n = 105) (50.5%)Nonaerated Sinuses (n = 103) (49.5%)P Value
Age (mean) (SD) (yr)8.00 (1.00)8.17 (1.01)7.83 (0.97).02
Sex (%).78
 Male51.950.553.4
 Female48.149.546.6
Ethnicity (%)a.37
 Dutch65.965.766.0
 Other Western8.29.56.8
 Non-Western22.119.025.2
Nonverbal IQ (mean) (SD)b102.81 (14.42)103.87 (15.72)101.78 (13.04).33
Maternal education (%)c.19
 Low4.81.97.8
 Medium36.134.337.9
 High46.250.441.7
Handedness (%)d.45
 Right87.589.585.4
 Left9.67.611.7
  • ↵a Missing data on ethnicity (3.8%).
  • ↵b Missing data on nonverbal IQ (13.0%).
  • ↵c Low indicates primary school/lower vocational education; Medium, intermediate vocational education; High, higher vocational education/university. Missing data on maternal education (11.5%).
  • ↵d Missing data on handedness (2.9%).