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Table 3 Timeline: Products given and questionnaires, tests and evaluations done during study period

From: An un-commissioned randomized, placebo-controlled double-blind study to test the effect of deep sea fish oil as a pain reliever for dogs suffering from canine OA

Time Questionnaires and visits Food, rescue analgesia and tested products Outcome variables, other tests and evaluations
Questionnaires At clinic
W −8 Internet / posted questionnaire   Descriptive data. Questionnaire on pain items, including HCPI. Lameness and QOL VAS. Use of NSAIDs / adjuvant analgesics.  
W −8 to W −2 Telephone interview   Questions about unclear answer in the inclusion questionnaire  
W −2 Screening visit New feed started. Questionnaire on pain items, including HCPI. Lameness and QOL VAS. Use of NSAIDs / adjuvant analgesics. Thorough veterinary evaluation + lameness, jumping and stairs on video. PVF, Impulse. Blood samples (inclusion). Radiographs.
W 0 Baseline visit Oils started. Rescue NSAID given to owner. Questionnaire on pain items, including HCPI. Lameness and QOL VAS. Use of NSAIDs / adjuvant analgesics. Veterinary evaluation: Lameness, jumping and stairs on video. PVF, Impulse. Blood samples.
W 4 4 weeks after baseline   Questionnaire on pain items, including HCPI. Lameness and QOL VAS. Use of rescue analgesic. Adverse effect questions. Comparative questions: locomotion, every-day situations and skin and hair-coat.  
W 8 8 weeks after baseline   Same as at W4.  
W 12 12 weeks after baseline   Same as at W4.  
W 16 End visit (16 weeks after baseline) Feed and oils stopped. Questionnaire on pain items, incl. HCPI. Lameness and QOL VAS. Use of rescue analgesic. Adverse effect questions. Comparative questions: locomotion, every-day situations and skin and hair-coat. Final assessment of outcome. Guessing group. Veterinary evaluation: Lameness, jumping and stairs on video. PVF, Impulse. Blood samples.