Table 1:

Characteristics of patients with diagnosis of concussion in Ontario, Canada

CharacteristicTiming of concussion; no. (%) of patients
Weekend
n = 39 940
Weekday
n = 195 170
Age, yr
 ≤2916 088 (40)67 793 (35)
 30–449 493 (24)50 390 (26)
 45–596 051 (15)35 727 (18)
 ≥608 308 (21)41 260 (21)
Sex
 Male22 380 (56)98 922 (51)
 Female17 560 (44)96 248 (49)
Income quintile
 Highest7 141 (18)37 700 (19)
 Next to highest7 500 (19)38 148 (20)
 Middle7 799 (20)38 209 (20)
 Next to lowest8 266 (21)38 973 (20)
 Lowest*9 234 (23)42 140 (22)
Home location
 Urban34 038 (85)167 975 (86)
 Rural*5 902 (15)27 195 (14)
Date of enrolment
 Remote18 874 (47)87 386 (45)
 Recent21 066 (53)107 784 (55)
Initial imaging
 Skull radiography2 728 (7)10 678 (5)
 Computed tomography7 364 (18)22 269 (11)
 Magnetic resonance imaging189 (< 1)1 654 (1)
 Any fracture830 (2)2 234 (1)
Prior diagnosis§
 Schizophrenia336 (1)1 362 (1)
 Depression1 707 (4)8 515 (4)
 Bipolar disorder603 (2)2 720 (1)
 Substance abuse1 554 (4)6 646 (3)
 Anxiety disorder8 223 (21)44 003 (23)
 Any condition9 734 (24)51 181 (26)
Prior hospital admission§1 491 (4)8 157 (4)
Prior suicide attempt§56 (< 1)200 (< 1)
  • * Includes missing values.

  • ”Remote” denotes years 1992–2001; “recent” denotes years 2002–2012.

  • Any bone (codes 800–829, International Classification of Diseases and Related Health Problems, 9th revision41).

  • § Assessed during the year before concussion.

  • Any of the specified psychiatric diagnoses listed above.