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Table 1 Characteristics of studies included in the systematic review

From: Could low birth weight and preterm birth be associated with significant burden of hip osteoarthritis? A systematic review

Author, country, and year Study population and % women Age of study population (mean ± SD) Hip OA or hip pathologies related to hip OA Prevalence % outcome (OA, DDH, α-angle, hip deformity) (men, women) Follow-up time (mean ± SD) Quality of studya
Hip bone shape abnormality
 Case-control study
  Chan et al., Australia, 1997 [35] All live births during 1986–93
n = 151,257
47%
28 days to 5 years Self-reported DDH, birth registry 0.75% DDH N/A Low
 Cross-sectional studies
  Orak et al., Turkey, 2015 [37] Infants born in one hospital
n = 467
44%
Preterm 31.11 ± 2.51 weeks
Term 40.22 ± 0.36 weeks
α-angle < 60 ° of the hip joint suggestive of immature or pathologic hip NR N/A Low
  Davis et al., UK, 1993 [36] Infants born in one hospital
n = 33
55%
3–4.5 years Hip deformity by footprint angle and hip rotation NR N/A Low
Hip OA
 Cohort studies
  Hussain et al., Australia
  2015 [32]
n = 3604 participants
60%
No arthroplasty 51.8 ± 10.0
Hip arthroplasty 59.0 ± 9.5
Hip arthroplasty for hip OA 2.1% 9.3 ± 2.1 High
  Clynes et al., UK 2014 [34] n = 444
50%
Median 75 years (IQR 73–77) American College of Rheumatology algorithm to define hip OA
Radiographic Kellgren and Lawrence (KL) score of hip to count osteophytes
Men 3.2%
Women 6.0%
13 years Fair
  1. DDH developmental dysplasia of the hip, IQR interquartile range, N/A not applicable, NR not reported, OA osteoarthritis, SD standard deviation
  2. a Evaluated using the National Heart Lung and Blood Institute (NHLBI) quality assessment tool for observational studies [27]