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Table 1 Demographic data of ADHD children group (N = 549) and control group (N = 3,564)

From: The associations between ADHD and asthma in Korean children

Variables Control group (%) ADHD group (%) F p value
Age a 7.78 ± 1.17 7.83 ± 1.20 4.476 .342
Gender b    1,131.268 .000
 Male 1,704(47.9%) 413(75.2%)   
 Female 1,857(52.1%) 136(24.8%)   
  1. These data represent mean ± S.D., by independent t testa, or N(%), by chi-square testb, significant p value <0.05, ADHD: attention deficit hyperactivity disorder.