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Table 3 Predefined hypotheses and the confirmation or rejection of the hypotheses for hip OA (n = 117) and knee OA (n = 284)

From: The Dutch Lower Extremity Functional Scale was highly reliable, valid and responsive in individuals with hip/knee osteoarthritis: a validation study

  Hip OA Knee OA
There is a moderate correlation (r > 0.6) between LEFS scores and HOOS/KOOS-PF subscale. Yes Yes
The correlation between the LEFS and the HOOS/KOOS-PF subscale is higher than the correlation between the LEFS and the other subscales of the HOOS/KOOS. Yes Yes
The correlation between LEFS and HADS scores is low (r < 0.5). Yes Yes
The correlation between LEFS and CIS scores is low (r < 0.5). No Yes
Patients with multiple painful lower limb joints demonstrate lower LEFS scores than patients with pain in a single joint. Yes Yes
Patients with complaints less than 5 years demonstrate higher LEFS scores than patients with complaints over 5 years. Yes No
The participants’ education level (primary, secondary or higher education) does not influence the LEFS scores. Yes No
Sociodemographic characteristics, such as sex, doing volunteer work, income, type of health insurance, and family status, are unrelated (r < 0.2) to the LEFS score: Yes Yes
  7/8 (88%) 6/8 (75%)
  1. Abbreviations: CIS = Checklist Individuals Strength, HADS = Hospital Anxiety and Depression Questionnaire, HOOS = Hip Osteoarthritis and Outcome Score, KOOS = Knee Osteoarthritis and Outcome Score, LEFS = Lower Extremity Functional Scale, OA = osteoarthritis, PF = physical function.