Table 3.
Distribution of Key Predictors for NASS-CDS Dataset by BMI group
| BMI Group (kg/m2) | Rao-Scott Chi Square | ||||||
|---|---|---|---|---|---|---|---|
| BMI <18.5 | 18.5≤BMI<25 | 25<BMI≤30 | 30<BMI≤35 | BMI>35 | |||
| Gender | Female | 86% | 64% | 35% | 44% | 50% | X2(4)=240.4 p<0.0001 |
| Male | 14% | 36% | 65% | 56% | 50% | ||
| deltaV (kph), Frontal Impacts | ΔV <15 | 46% | 29% | 32% | 26% | 26% | X2(12)=8.1, p=0.78 |
| 15≤ ΔV <30 | 39% | 55% | 52% | 56% | 60% | ||
| 30≤ ΔV <45 | 13% | 14% | 13% | 16% | 12% | ||
| ΔV > 45 | 2% | 2% | 3% | 2% | 2% | ||
| deltaV (kph), Nearside Impacts | ΔV <15 | 22% | 47% | 43% | 74% | 50% | X2(12)=44.8 p<0.0001 |
| 15≤ ΔV <30 | 50% | 44% | 47% | 21% | 40% | ||
| 30≤ ΔV <45 | 13% | 7% | 9% | 4% | 8% | ||
| ΔV > 45 | 15% | 2% | 1% | 1% | 2% | ||
| deltaV (kph), Farside Impacts | ΔV <15 | 68% | 55% | 41% | 54% | 53% | X2(12)=16.8, p=0.16 |
| 15≤ ΔV <30 | 25% | 37% | 48% | 32% | 39% | ||
| 30≤ ΔV <45 | 6% | 7% | 9% | 13% | 8% | ||
| ΔV > 45 | 1% | 1% | 2% | 1% | 0% | ||
| N Quarter Turns (Rollover only) | 1-2 | 88% | 53% | 47% | 53% | 73% | |
| 3-6 | 11% | 42% | 49% | 41% | 25% | ||
| 7-10 | 1% | 5% | 4% | 6% | 2% | ||
| 11-13 | 0% | 0% | 0% | 0% | 0% | ||
| >13 | 0% | 0% | 0% | 0% | 0% | ||
| Age Gp (yrs) | 15-24 | 1% | 4% | 6% | 7% | 6% | X2(16)=216.7, p<0.0001 |
| 25-44 | 18% | 33% | 40% | 38% | 46% | ||
| 45-64 | 11% | 17% | 23% | 35% | 28% | ||
| 65-74 | 2% | 3% | 6% | 3% | 2% | ||
| ≥75 | 68% | 43% | 25% | 17% | 18% | ||
| Belt Use | 3-point | 91% | 91% | 90% | 90% | 89% | X2(4)=3.3, p=0.50 |
| No | 9% | 9% | 10% | 10% | 11% | ||
| Seat Location | Driver | 72% | 80% | 84% | 86% | 85% | X2(4)=41.0, p=<0.0001 |
| Passenger | 28% | 20% | 16% | 14% | 15% | ||
| Multiple Severe Impacts | No | 93% | 97% | 97% | 97% | 93% | X2(4)=12.0 p=0.0175 |
| Yes | 7% | 3% | 3% | 3% | 7% | ||
| Vehicle Type | Car | 71% | 66% | 56% | 55% | 53% | X(12)=97.6 p<0.0001 |
| Pickup | 5% | 9% | 19% | 18% | 14% | ||
| Utility | 15% | 19% | 18% | 20% | 22% | ||
| Van | 9% | 6% | 7% | 7% | 11% | ||
| Crash Mode | Farside | 13% | 16% | 12% | 11% | 12% | X2(16)=23.9, p=0.0272 |
| Frontal | 50% | 60% | 60% | 61% | 62% | ||
| Nearside | 6% | 13% | 14% | 18% | 13% | ||
| Rollover | 31% | 11% | 14% | 10% | 13% | ||
| Model Year | 2000-2002 | 57% | 56% | 48% | 53% | 52% | X2(16)=30.0, p=0.0028 |
| 2003-2005 | 16% | 22% | 27% | 22% | 20% | ||
| 2006-2008 | 24% | 18% | 20% | 20% | 23% | ||
| 2009-2011 | 3% | 4% | 5% | 5% | 5% | ||
* X2(n): The number n in parentheses refers to the number of degrees of freedom.