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Table 3 Means (SDs within parenthesis) for weekly total headache activity (headache sum), number of headache days, intensity and duration for the 3-week diary recording period by student sex, grade, school location and assessment point

From: Headache prevalence and characteristics among school children as assessed by prospective paper diary recordings

  Headache sum Headache days Intensityb Durationb,c
(0–140) (0–7) (1–5) (1–4)
All 8.5 (10.1) 2.5 (2.1) 1.7 (0.7) 1.6 (0.6)
Sex
 Boys 6.8 (8.7) 2.0 (1.9) 1.7 (0.7) 1.6 (0.7)
 Girls 10.3 (11.2) 3.0 (2.1) 1.8 (0.7) 1.6 (0.6)
Grades
 6 6.9 (7.8) 2.2 (1.9) 1.7 (0.6) 1.5 (0.6)
 7 9.9 (12.2) 2.5 (2.2) 1.9 (0.8) 1.7 (0.6)
 8 7.4 (9.0) 2.4 (2.2) 1.8 (0.8) 1.6 (0.7)
 9 9.1 (11.8) 2.6 (2.0) 1.6 (0.5) 1.7 (0.7)
 11a 9.5 (7.5) 3.2 (1.8) 1.6 (0.4) 1.7 (0.5)
School location
 City 8.8 (9.8) 2.8 (2.1) 1.6 (0.5) 1.6 (0.6)
 Town 8.0 (10.6) 2.0 (1.9) 1.9 (0.8) 1.7 (0.7)
Time point
 Week one 8.7 (12.2) 2.6 (2.4) 1.6 (0.6) 1.6 (0.7)
 Week two 8.2 (11.6) 2.4 (2.3) 1.7 (0.7) 1.6 (0.8)
 Week three 8.4 (12.2) 2.4 (2.4) 1.7 (0.8) 1.7 (0.8)
  1. aSecond grade in high school
  2. bIntensity and duration scores calculated for headache episodes
  3. cUnit length 5 h