Larson 2019.

Study characteristics
Methods	Design: retrospective Unit of randomization: baby
Participants	Location/Setting: single (children's hospital); Chicago Sample size: 176 babies (29 = right hip, 88 = left hip, 59 = bilateral) Number of withdrawals/dropouts: not stated Sex: 142 girls, 34 boys Mean age: 1.2 months (SD 1.3) Graf: not reported Inclusion criteria: diagnosed with DDH by ultrasound or examination; younger than 6 months; treated with Pavlik harness Exclusion criteria: cerebral palsy; neuromuscular conditions; teratologic hip dislocation or babies lost to follow up before 1 year
Interventions	Intervention (sample size): < 30 days age at which Pavlik harness was initiated (n = 94) Intervention 2 (sample size): 30 to 60 days age at which Pavlik harness was initiated (n = 40) Control (sample size): 60 to 180 days age at which Pavlik harness was initiated (n = 42)
Outcomes	Primary outcome(s): need for operative intervention Secondary outcome(s): none Timing of outcome assessment: within first year of life
Notes	Study start date: 2004 Study end date: 2010 Funding source: none Conflicts of interest: the authors declare no conflicts of interest. Comment(s): none