Table 3

Unadjusted ORs (95% CIs) for changes in CRS practices between pre-legislation and post-legislation in Shenzhen

VariablesCRS possessionCRS useAppropriate CRS use
Overall6.891 (6.303 to 7.533)*4.333 (3.960 to 4.740)*0.730 (0.615 to 0.865)*
2–3 years (vs 0–1 years)1.410 (1.243 to 1.598)*1.472 (1.294 to 1.674)*5.622 (4.003 to 7.897)*
4–6 years (vs 0–1 years)2.011 (1.819 to 2.224)*1.730 (1.561 to 1.919)*0.600 (0.499 to 0.721)*
Boy (vs girl)1.028 (0.951 to 1.110)1.041 (0.964 to 1.124)0.936 (0.824 to 1.062)
Male (vs female)1.009 (0.929 to 1.097)1.099 (1.011 to 1.194)*0.894 (0.782 to 1.022)
College or above (vs <college)1.604 (1.465 to 1.755)*1.816 (1.653 to 1.995)*1.300 (1.109 to 1.525)*
High car price (vs low)1.674 (1.548 to 1.809)*1.660 (1.537 to 1.794)*0.921 (0.811 to 1.047)
Higher trip frequency (vs low)2.264 (1.977 to 2.593)*2.411 (2.101 to 2.766)*1.223 (0.977 to 1.513)
High trip frequency (vs low)1.666 (1.478 to 1.878)*1.867 (1.648 to 2.115)*1.396 (1.129 to 1.724)*
Moderate trip frequency (vs low)1.251 (1.106 to 1.414)*1.332 (1.171 to 1.515)*1.291 (1.034 to 1.612)*
Longer trip distance (vs short)1.288 (1.145 to 1.450)*1.284 (1.141 to 1.445)*1.216 (1.001 to 1.478)*
Long trip distance (vs short)1.283 (1.155 to 1.424)*1.312 (1.181 to 1.457)*1.281 (1.076 to 1.525)*
Moderate trip distance (vs short)1.289 (1.163 to 1.429)*1.292 (1.165 to 1.433)*1.132 (0.955 to 1.341)
Seat-belt use (vs non-use)1.864 (1.481 to 2.347)*7.426 (5.113 to 10.785)*1.764 (0.862 to 3.610)
High knowledge score (vs low)2.678 (2.473 to 2.900)*2.804 (2.589 to 3.036)*1.199 (1.052 to 1.367)*

  • *P value <0.05.

  • CRS, child restraint system.