Table 1 Participant Characteristics
|  | PPTH Group (n = 21 | No-PPTH (n = 21) |  |
|---|---|---|---|
Variable | Mean ± SD | Mean ± SD | p-value |
Age, years | 29.5 ± 9.4 | 32.9 ± 9.8 | 0.253 |
Sex, % female | 66.7% | 33.3% | 0.013* |
Body Mass Index | 28.7 ± 9.2 | 26.8 ± 4.9 | 0.414 |
Education | |||
 Some HS | 5.3% | 9.5% |  |
 HS degree | 47.4% | 33.3% |  |
 2 year College degree | 15.8% | 9.0% |  |
 4 year College degree | 15.8% | 28.6% |  |
 Masters or above | 15.8% | 9.5% |  |
Race | |||
 African American | 38.1% | 14.3% |  |
 Asian/Pacific Islander | 0.0% | 4.8% |  |
 Caucasian | 52.4% | 66.7% |  |
 Hispanic | 4.8% | 14.3% |  |
 Other | 4.8% | 0.0% |  |
Frequency of headaches at 1–2 weeks post injury (since injury) | |||
 No headaches since injury | 0.0% | 14.7% |  |
 About once a week | 4.8% | 19.0% |  |
 Several times a week | 47.6% | 33.3% |  |
 Daily | 42.9% | 33.3% |  |
 Constant | 4.8% | 0.0% |  |
Frequency of headaches at 1-month post injury (past month) | |||
 No headaches since 1-week visit | 0.0% | 33.3% |  |
 About once a month | 14.3% | 19.0% |  |
 About once a week | 33.3% | 19.0% |  |
Several times a week | 23.8% | 23.8% | Â |
 Daily | 23.8% | 4.8% |  |
 Constant | 4.8% | 0.0% |  |
Frequency of headaches at 4-months post injury (past 3 months) | |||
 No headaches since 1-month visit | 0.0% | 57.1% |  |
 Less than once a month | 0.0% | 42.9% |  |
 At least once a month | 14.3% | 0.0% |  |
 About once a week | 52.4% | 0.0% |  |
 Several times a week | 28.6% | 0.0% |  |
 Daily | 4.8% | 0.0% |  |
 Constant | 0.0% | 0.0% |  |