Table 5.
Regression: Positional Differences in Frequency of Postimpact Symptoms
| χ2 (p value) | B (p value) | χ2 (p value) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | OL | DL | RB | LB | DB | ST | TE | WR | QB | Position | Team | Duration | |
| Dizziness | 72.62 (<0.001) | Ref | −0.29 (0.038) | −0.47 (0.003) | −0.21 (0.118) | −0.59 (<0.001) | −1.09 (<0.001) | 0.04 (0.851) | −0.64 (<0.001) | −0.56 (0.003) | 51.92 (<0.001) | 21.22 (0.012) | 0.93 (0.336) |
| Bell rung | 113.93 (<0.001) | Ref | −0.37 (0.008) | −0.44 (0.005) | −0.09 (0.500) | −0.69 (<0.001) | −1.42 (<0.001) | 0.00 (0.985) | −0.45 (0.003) | −0.49 (0.010) | 68.81 (<0.001) | 41.05 (<0.001) | 7.56 (0.006) |
| Loss of consciousness | 28.95 (0.049) | Ref | −0.04 (0.442) | −0.07 (0.228) | 0.02 (0.764) | 0.01 (0.916) | −0.11 (0.173) | −0.06 (0.447) | 0.10 (0.091) | −0.07 (0.340) | 11.87 (0.157) | 17.15 (0.046) | 0.16 (0.687) |
| Saw stars | 68.47 (<0.001) | Ref | −0.12 (0.364) | −0.31 (0.032) | 0.12 (0.343) | −0.34 (0.005) | −0.65 (0.001) | −0.22 (0.208) | −0.39 (0.003) | −0.22 (0.209) | 31.99 (<0.001) | 18.58 (0.029) | 15.08 (<0.001) |
| Vomited or felt nauseous | 42.15 (0.001) | Ref | −0.06 (0.291) | −0.09 (0.166) | −0.07 (0.236) | −0.10 (0.076) | −0.21 (0.022) | −0.16 (0.044) | −0.11 (0.078) | −0.18 (0.028) | 10.78 (0.215) | 32.53 (<0.001) | 0.00 (0.959) |
| Forgot what to do on the field | 36.90 (0.005) | Ref | 0.03 (0.768) | −0.08 (0.378) | 0.14 (0.093) | −0.10 (0.219) | −0.18 (0.179) | −0.12 (0.289) | −0.05 (0.579) | 0.04 (0.737) | 13.41 (0.098) | 20.97 (0.013) | 1.72 (0.189) |
| Headache ≥1 time in week after hit | 76.25 (<0.001) | Ref | −0.30 (0.037) | −0.27 (0.098) | −0.16 (0.271) | −0.60 (<0.001) | −1.24 (<0.001) | −0.20 (0.303) | −0.62 (<0.001) | −0.80 (<0.001) | 54.37 (<0.001) | 24.35 (0.004) | 0.99 (0.319) |
| Concentration difficulties | 47.97 (<0.001) | Ref | −0.07 (0.533) | −0.14 (0.292) | −0.13 (0.248) | −0.43 (<0.001) | −0.47 (0.009) | −0.13 (0.392) | −0.33 (0.006) | −0.34 (0.030) | 25.06 (0.002) | 23.84 (0.005) | 1.18 (0.278) |
Reflects differences in postimpact symptom frequency outcomes, based on GLM regression including position, team membership, and duration of football career.
OL, offensive linemen; DL, defensive linemen; RB, running backs; DB, defensive backs; ST, special teams; TE, tight end; WR, wide receiver; QB, quarterback.