Sample characteristics
| Characteristic | Unweighted N (%) | Weighted/age-adjusted estimate (95% CI) |
| Age | ||
| 0–3 years | 66 (31.0) | 33.81 (12.19 to 55.42) |
| 4–8 years | 108 (50.7) | 41.22 (29.97 to 52.48) |
| 9–12 years | 39 (18.3) | 24.97 (3.02 to 46.92) |
| Gender | ||
| Male | 108 (51.2) | 49.05 (40.36 to 57.54) |
| Female | 103 (48.8) | 50.95 (42.25 to 59.64) |
| Restraint type | ||
| Rear-facing restraint | 12 (5.7) | 5.09 (0.01 to 11.08) |
| Forward-facing restraint | 124 (58.5) | 54.84 (26.65 to 83.02) |
| Booster | 35 (16.5) | 14.01 (3.93 to 24.09) |
| Adult seat belt | 41 (19.3) | 26.06 (2.85 to 49.27) |
| Appropriate* | ||
| Yes | 211 (99.1) | 99.32 (98.39 to 100.00) |
| No | 2 (0.9) | 0.68 (0.00 to 1.61) |
| Any error | ||
| No | 51 (24.1) | 27.31 (10.82 to 43.79) |
| Yes | 161 (75.9) | 72.69 (56.21 to 89.18) |
| Installation error | ||
| No | 90 (42.4) | 46.14 (26.02 to 66.26) |
| Yes | 122 (57.6) | 53.86 (33.74 to 73.98) |
| Securing error | ||
| No | 70 (33.0) | 35.07 (22.79 to 47.34) |
| Yes | 142 (67.0) | 64.93 (52.65 to 77.21) |
| Serious error | ||
| No | 92 (43.4) | 43.85 (54.99 to 52.72) |
| Yes | 120 (56.6) | 56.15 (47.28 to 65.01) |
| Installation error (serious) | ||
| No | 130 (61.3) | 64.01 (52.64 to 75.36) |
| Yes | 82 (38.7) | 35.99 (24.63 to 47.35) |
| Securing (serious) | ||
| No | 126 (59.4) | 59.33 (52.79 to 65.88) |
| Yes | 86 (40.6) | 40.67 (34.12 to 47.21) |
| Characteristic | M (SE) | 95% CI for mean |
| Weigh (kg) | ||
| Overall | 23.4 (3.4) | 15.4 to 31.4 |
| Rear-facing restraint | 8.7 (0.3) | 7.9 to 9.4 |
| Forward-facing restraint | 15.5 (0.7) | 13.9 to 17.0 |
| Booster | 22.4 (1.4) | 19.2 to 25.6 |
| Adult Seat Belt | 43.7 (3.4) | 35.5 to 51.8 |
| Height(mm) | ||
| Overall | 111.8 (6.2) | 97.1 to 126.5 |
| Rear-facing restraint | 70.6 (3.4) | 62.6 to 78.5 |
| Forward-facing restraint | 98.1 (2.0) | 93.4 to 102.8 |
| Booster | 116.6 (1.9) | 112.0 to 121.2 |
| Adult seat belt | 143.7 (1.4) | 140.4 to 147.0 |
*New South Wales legal definition.