Table 3

Risk of ADHD among frequency for FS-related medical visits in Cox's proportional hazard regression

Frequency for medical visit (per 5 years)ADHD casePerson-yearsIRHR (95% CI)
All
 None18038 1264.721.00
 1–23777774.761.01 (0.71 to 1.44)
 3–416117913.572.89 (1.73 to 4.82)***
 >42261635.697.66 (4.92 to 11.9)***
 p Value for trend<0.0001
Boy
 None14821 8656.771.00
 1–22845196.200.92 (0.61 to 1.38)
 3–41357922.473.34 (1.89 to 5.88)***
 >41740441.986.29 (3.81 to 10.4)***
 p Value for trend<0.0001
Girl
 None3216 2601.971.00
 1–2932582.761.40 (0.67 to 2.94)
 3–436005.002.58 (0.79 to 8.43)
 >4521123.6512.4 (4.82 to 31.8)***
 p Value for trend<0.0001
  • ***p<0.001.

  • ADHD, attention deficit-hyperactivity disorder; FS, febrile seizures; IR, incidence rate, per 1000 person-years.