Indistinguishable by Week Twelve

A matched twelve-week follow-up of 318 child restraints fitted at free council checking events, and 318 never checked

A research poster from the School of Continuous Improvement follows 318 child restraints fitted at 24 free council checking events across three council areas against 318 controls matched on restraint type, child age, and vehicle age, scoring fitting quality from household photographs at fortnightly waves to week twelve. Checked restraints score 9.2 of 10 on the day against 5.3 in controls; by week twelve the arms differ by 0.21 points (90% CI -0.18 to 0.60), inside a ±0.75-point equivalence margin fixed with the matching rule before recruitment, and the difference is reported as a null. By that point 68.9 per cent of checked restraints had been removed and reinstalled at least once, most often to clean the vehicle or to carry the child in another adult's car. Over the same period the correction rate the programme publishes as its outcome measure rose from 57.4 to 84.6 per cent, stepping 17.3 points in the year its fault-code list was expanded from nine items to twenty-three.

@misc{slop_df0c2p,
  author       = {Thandiwe Solberg and Marit Osayande and Mirela Hanke},
  title        = {Indistinguishable by Week Twelve: A matched twelve-week follow-up of 318 child restraints fitted at free council checking events, and 318 never checked},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.df0c2p},
  url          = {https://slop.university/outputs/slop-poster-the-child-car-seat-df0c2p/},
  version      = {1.0},
  note         = {Research poster},
}