Table 2.
Distribution of Key Predictors for NASS-CDS by Age Group (years)
| Age Group (yrs) | Rao-Scott Chi Square | ||||||
|---|---|---|---|---|---|---|---|
| 16-24 | 25-44 | 45-64 | 65-74 | ≥75 | |||
| Gender | Female | 48% | 48% | 51% | 47% | 43% | X2(4)=4.8 p=0.32 |
| Male | 52% | 52% | 49% | 53% | 57% | ||
| deltaV (kph), Frontal Impacts | ΔV <15 | 26% | 28% | 36% | 37% | 37% | X2(12)=16.2, p=0.18 |
| 15≤ ΔV <30 | 56% | 56% | 51% | 44% | 52% | ||
| 30≤ ΔV <45 | 15% | 14% | 11% | 17% | 8% | ||
| ΔV > 45 | 3% | 2% | 2% | 2% | 3% | ||
| deltaV (kph), Nearside Impacts | ΔV <15 | 38% | 55% | 60% | 45% | 38% | X2(12)=32.3, p=0.001 |
| 15≤ ΔV <30 | 46% | 39% | 35% | 50% | 50% | ||
| 30≤ ΔV <45 | 14% | 5% | 4% | 4% | 7% | ||
| ΔV > 45 | 2% | 1% | 1% | 1% | 5% | ||
| deltaV (kph), Farside Impacts | ΔV <15 | 43% | 46% | 65% | 38% | 37% | X2(12)=36.8, p=0.0002 |
| 15≤ ΔV <30 | 46% | 43% | 30% | 49% | 50% | ||
| 30≤ ΔV <45 | 9% | 10% | 4% | 13% | 9% | ||
| ΔV > 45 | 2% | 1% | 1% | 0% | 4% | ||
| N Quarter Turns (Rollover only) | 1-2 | 54% | 51% | 60% | 44% | 35% | |
| 3-6 | 42% | 44% | 34% | 53% | 60% | ||
| 7-10 | 4% | 5% | 6% | 3% | 5% | ||
| 11-13 | 0% | 0% | 0% | 0% | 0% | ||
| >13 | 0% | 0% | 0% | 0% | 0% | ||
| BMI | BMI < 18.5 | 4% | 1% | 1% | 0% | 1% | X2(16)=216.7, p<0.0001 |
| 18.5≤BMI<25 | 50% | 32% | 27% | 24% | 28% | ||
| 25<BMI≤30 | 35% | 46% | 44% | 51% | 60% | ||
| 30<BMI≤35 | 7% | 13% | 20% | 17% | 8% | ||
| BMI>35 | 4% | 8% | 8% | 8% | 3% | ||
| Belt Use | 3-point | 87% | 90% | 92% | 95% | 94% | X2(4)=30.6, p<0.0001 |
| No | 13% | 10% | 8% | 5% | 6% | ||
| Seat Location | Driver | 79% | 86% | 84% | 81% | 80% | X2(4)=15.6, p=0.007 |
| Passenger | 21% | 14% | 16% | 19% | 20% | ||
| Multiple Severe Impacts | No | 96% | 97% | 97% | 98% | 98% | X2(4)=9.8, p=0.044 |
| Yes | 4% | 3% | 3% | 2% | 2% | ||
| Vehicle Type | Car | 71% | 53% | 51% | 59% | 75% | X2(12)=143.0, p<0.0001 |
| Pickup | 11% | 17% | 19% | 9% | 6% | ||
| Utility | 16% | 22% | 20% | 21% | 9% | ||
| Van | 2% | 8% | 10% | 11% | 10% | ||
| Crash Mode | Farside | 11% | 13% | 15% | 18% | 16% | X2(16)=35.4, p=0.0009 |
| Frontal | 60% | 61% | 60% | 58% | 57% | ||
| Nearside | 12% | 13% | 17% | 18% | 18% | ||
| Rollover | 17% | 13% | 8% | 6% | 9% | ||
* X2(n): The number n in parentheses refers to the number of degrees of freedom.