The relationship between demographics of bicyclists with PCS (mean duration of 23.7 months) and the duration of symptoms (n=28)
| 3–9 m | 10–19 m | 20–29 m | 30–39 m | ≥40 m | N (% of sample) | Test statistic | |
| n (% of sample) | 7 (25.0) | 6 (21.4) | 7 (25.0) | 4 (14.3) | 4 (14.3) | 28 (100.0) | |
| Sex, n (%) | P=0.96* | ||||||
| Male | 4 (14.3) | 2 (7.1) | 3 (10.7) | 1 (3.6) | 3 (10.7) | 13 (46.4) | |
| Female | 3 (10.7) | 4 (14.3) | 4 (14.3) | 3 (10.7) | 1 (3.6) | 15 (53.6) | |
| Age at time of concussion, n (%) | P=0.52† | ||||||
| ≤29 | 1 (3.6) | 3 (10.7) | 0 (0.0) | 0 (0.0) | 1 (3.6) | 5 (17.9) | |
| 30–64 | 6 (21.4) | 3 (10.7) | 7 (25.0) | 3 (10.7) | 3 (10.7) | 22 (78.6) | |
| ≥65 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (3.6) | 0 (0.0) | 1 (3.6) | |
| Previous concussion, n (%) | P=0.032† | ||||||
| 0 | 2 (7.1) | 4 (14.3) | 2 (7.1) | 0 (0.0) | 0 (0.0) | 8 (28.6) | |
| 1–3 | 4 (14.3) | 1 (3.6) | 5 (17.9) | 3 (10.7) | 2 (7.1) | 15 (53.6) | |
| 4–7 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (7.1) | 2 (7.1) | |
| ≥8 | 1 (3.6) | 1 (3.6) | 0 (0.0) | 1 (3.2) | 0 (0.0) | 3 (10.7) | |
| Pre-existing conditions, n (%) | P=0.90* | ||||||
| Migraines | 2 (7.1) | 2 (7.1) | 0 (0.0) | 1 (3.6) | 0 (0.0) | 5 (17.9) | |
| Anxiety | 0 (0.0) | 1 (3.6) | 1 (3.6) | 0 (0.0) | 0 (0.0) | 2 (7.1) | |
| Depression | 0 (0.0) | 1 (3.6) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (3.6) | |
| ADD/ADHD | 0 (0.0) | 1 (3.6) | 1 (3.6) | 0 (0.0) | 0 (0.0) | 2 (7.1) | |
| Bipolar disorder | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (3.6) | 0 (0.0) | 1 (3.6) | |
| Multiple comorbidities | 1 (3.6) | 0 (0.0) | 1 (3.6) | 1 (3.6) | 2 (7.1) | 5 (17.9) | |
| None | 4 (14.3) | 1 (3.6) | 4 (14.3) | 1 (3.6) | 2 (7.1) | 12 (42.9) | |
| Helmet use, n (%) | P=0.41* | ||||||
| Yes | 5 (17.9) | 4 (14.3) | 5 (17.8) | 3 (10.7) | 3 (10.7) | 20 (71.4) | |
| No | 2 (7.1) | 2 (7.1) | 2 (7.1) | 1 (3.6) | 1 (3.6) | 8 (28.6) |
*Mann-Whitney U test.
†Kruskal-Wallis H test.
PCS, postconcussion syndrome.