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Table 1 Demographic characteristics of the school sample by sex and grade

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

  Boys (n = 245) Girls (n = 232) Total (N = 477)
Grades
 6 61 (54.5%) 51 (45.5%) 112 (23.5%)
 7 47 (48%) 51 (52%) 98 (20.5%)
 8 58 (59.2%) 40 (40.8%) 98 (20.5%)
 9 63 (52.1%) 58 (47.9%) 121 (25.4%)
 11a 16 (33.3%) 32 (66.7%) 48 (10.1%)
Location
 City 147 (60%) 98 (40%) 245 (51.4%)
 Town 132 (57%) 100 (43%) 232 (48.6%)
  1. Number of subjects with percentages within parenthesis
  2. aSecond grade in high school