American Academy of Pediatrics The Injury Prevent Program materials converted to web-based materials.

An injury prevention attitudes & beliefs scale was created across all content areas (e.g., "It is never ok to use a second hand car seat even if you know the car seat has never been involved in a crash."). Thirty-four items assessed attitudes & beliefs for parents of younger children and 33-items for parents of older children (alpha = .85 for both younger and older children). All items were assessed using a 5-point Likert scale with 1 = strongly disagree to 5 = strongly agree.

An injury prevention self-efficacy scale was created from 36 items across all content areas for the parents of younger children and 35 items for parents of older (e.g., "I am confident that I know the safest way to store guns and ammunition") (alpha = .77 for younger children and .89 for older children.) All items were assessed using a 5-point Likert scale with 1 = strongly disagree to 5 = strongly agree.

Three items were used to assess knowledge of car safety injury prevention (e.g., "Your child should use a forward-facing safety seat until…") with the response coded as either 0 = incorrect or 1 = correct.

Two items were used to assess attitudes and beliefs towards car safety injury prevention (e.g., "It is never ok to use a second car seat even if you know the car seat has never been involved in a crash"). Both items were assessed with a 5-point Likert scale with 1 = strongly disagree and 5 = strongly agree. Both of the attitudes & beliefs items for the car safety attitudes content area were discarded because the wording proved confusing to participants.

Four items were used to assess self-efficacy in performing car safety injury prevention skills (e.g., "How confident are you that you know when to transition your child into a booster seat?"). Items were assessed with a 5-point Likert scale with 1 = not at all confident and 5 = extremely confident.

Two items were used to assess knowledge of wheeled sports injury prevention (e.g., "A child carrier bike seat should…") with the response coded as either 0 = incorrect or 1 = correct.

Four items were used to assess attitudes & beliefs towards wheeled sports safety injury prevention (e.g., "It is extremely important for my child to wear a helmet whenever riding his or her bike"). Items were assessed with a 5-point Likert scale with 1 = strongly disagree and 5 = strongly agree.

Three items were used to assess self-efficacy in performing wheeled sports injury prevention skills (e.g., "How confident are you that you know how to correctly check the fit of your child's helmet?"). Items were assessed with a 5-point Likert scale with 1 = not at all confident and 5 = extremely confident.