|No of studies||Design||Quality Assessment||No of participants||Absolute effect||Quality|
|Risk of bias||Inconsistency||Indirectness||Imprecision||Other|
|Mean age ranged between 18 months and 4.9 years. Data were collected cross-sectionally only. Sleep duration was assessed by parent report. Risks/injuries were assessed using medical record data, the Injury Behavior Checklist, interviews, or chart reviews of injuries.|
|3||Cross-sectional studya||No serious risk of bias||No serious inconsistency||No serious indirectness||No serious imprecision||None||2382||
Children with shorter sleep duration sustained a higher number of medically attended injuries (b = 0.1759, p < 0.05) .|
Usual sleep duration shorter than 8 h was associated with an increased risk of accidental falls (OR = 2.7, 95% CI 1.2–6.1) .
The Children’s Sleep Habits Questionnaire (CSHQ) sleep duration score did not significantly differ between the high injury and low injury groups (5.93 ± 1.03 vs. 6.36 ± 0.96, respectively, p = 0.09). Also, the CSHQ sleep duration score did not significantly differ between the high-injury-behavior and the low-injury-behavior groups (5.73 ± 2.10 vs. 4.32 ± 1.92, respectively, p not provided) after Bonferroni correction. The Pearson correlation coefficient between sleep duration and the total Injury Behavior Checklist score was r = 0.32, p = 0.005. To specifically examine the relationship between parent-reported sleep duration and injuries and injury behavior, they divided the group by median split for sleep duration (low sleep < 690 min, high sleep ≥690 min). There were no significant differences in the number of injuries in the past 2 years or in the Injury Behavior Checklist total score .