Sample characteristics
| Variable | Sample N | Control | Intervention | P value |
| Gender | 0.758 | |||
| Male | 18 (47%) | 9 (45%) | 9 (50%) | |
| Female | 20 (53%) | 11 (55%) | 9 (50%) | |
| Language other than English | 0.973 | |||
| English only | 17 (46%) | 9 (45%) | 8 (47%) | |
| Other language | 20 (54%) | 11 (55%) | 9 (53%) | |
| Highest level of education | 0.639 | |||
| Secondary | 6 (16%) | 3 (15%) | 3 (17%) | |
| Some tertiary/TAFE | 4 (10%) | 3 (15%) | 1 (5%) | |
| University | 28 (74%) | 14 (70%) | 14 (78%) | |
| Combined household income | 0.828 | |||
| Prefer not to say | 7 (18%) | 4 (20%) | 3 (17%) | |
| <$60,000 | 16 (42%) | 9 (45%) | 7 (39%) | |
| $60,000-$100,000 | 10 (26%) | 4 (20%) | 6 (33%) | |
| >$100,000 | 5 (13%) | 3 (15%) | 2 (11%) | |
| Ever installed a child restraint into a vehicle | 0.468 | |||
| No | 28 (74%) | 16 (80%) | 12 (67%) | |
| Yes | 10 (26%) | 4 (20%) | 6 (33%) | |
| Installed a child restraint into a vehicle in the last 2 years | 0.083 | |||
| No | 32 (80%) | 19 (95%) | 13 (72%) | |
| Yes | 6 (20%) | 1 (5%) | 5 (28%) | |
| Ever secured a child within a restraint system | 0.112 | |||
| No | 22 (58%) | 9 (45%) | 13 (72%) | |
| Yes | 16 (42%) | 11 (55%) | 5 (28%) | |
| Ever transported children | 0.506 | |||
| No | 25 (66%) | 12 (48%) | 13 (52%) | |
| Yes | 13 (34%) | 8 (62%) | 5 (3%) | |
| Forward-facing restraint recently installed | 0.566 | |||
| No | 31 (82%) | 17 (85%) | 14 (78%) | |
| Yes | 7 (18%) | 3 (15%) | 4 (22%) | |
| Age | 0.408 | |||
| 18–25 | 19 (50%) | 10 (53%) | 9 (47%) | |
| 26–35 | 13 (34%) | 8 (62%) | 5 (38%) | |
| 36–45 | 3 (8%) | 1 (33%) | 2 (67%) | |
| 56–65 | 1 (3%) | 1 (100%) | 0 (0%) | |
| >65 | 2 (6%) | 0 (0%) | 2 (100%) | |