Odds ratios for misuse by seat type, weight, and age
| # of seats misused | # of seats not misused | Odds ratio (95% confidence interval) | |
|---|---|---|---|
| *40 lb = 18.1 kg. | |||
| Booster type | |||
| Shield booster (n=59) | 40 | 19 | 8.7 (4.5 to 16.8) |
| Belt positioning booster (n=164) | 32 | 132 | p<0.0001 |
| Weight (lb)* | |||
| <40 (n=136) | 53 | 83 | 2.05 (1.1 to 3.8) |
| ≥40 (n=76) | 18 | 58 | p=0.02 |
| Age (years) | |||
| <4 (n=114) | 40 | 74 | 1.2 (0.7 to 2.1) |
| ≥4 (n=100) | 31 | 69 | p=0.5 |