Research question | Outcome | Method of analysis | Results from the model data set | |
---|---|---|---|---|
All respondents, n = 244 | Highly compliant respondents, answering 80% (≥15/18 weeks), n = 161 | |||
4A: Association of baseline variables with outcome | Weekly recorded pain days, count variable, assuming a binominal distribution | Multilevel mixed-effects logistic regression or generalized estimating equation assuming a logit link function (Long previous duration reference category) | Subject specific OR = 3.31 (95% CI: 2.1-5.1) Population average OR = 1.96 (95% CI 1.4-2.6) (Note: Interaction duration*week significant) | Subject specific OR = 2.67 (95% CI: 1.6-4.5) Population average OR =1.52 (95% CI 1.1- 2.2) (Note: Interaction duration*week significant) |
4B: Association of baseline variables with outcome | Weekly recorded pain days, count variable, assuming a Poisson distribution | Multilevel mixed-effects Poisson regression assuming a log link function (Long previous duration reference category) | Subject specific IRR = 1.92 (95% CI: 1.5 – 2.4) (Note: Interaction duration*week significant) | Subject specific IRR = 1.82 (95% CI: 1.4 – 2.4) (Note: Interaction duration*week significant) |
4 C: Association of baseline variables with outcome | Weekly recorded pain days, considered a count variable and assuming a normal distribution | Generalized linear regression or mixed linear model assuming an identity link function | Average difference in pain days for Long duration – Short duration 1.20 (95% CI: 0.8 – 1.5) (Note: Interaction duration*week significant) | Average difference in pain days for Long duration –Short duration 0.95 (95% CI: 0.6-1.4) Note: Interaction duration*week significant) |