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3A: Incidence during the full study period for the whole sample and for subgroups
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Recovery, i.e. reporting 0 or 1 pain days in 2 consecutive weeks = Event
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Time to event analysis, with Kaplan Meier curves. Log rank test for differences between groups
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Illustrated in Figure 2. Logrank test for effect of previous duration: p < 0.001
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Logrank testfor effect of previous duration: p = 0.002
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3B: Incidence for the full study period in relation to the selected predictive variables
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Recovery, i.e. reporting 0 or 1 pain days in 2 consecutive weeks = Event
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Time to event analysis with a) Cox proportional hazard regression or b) Discrete hazard regression
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Hazard ratio (HR) showing recovery, long duration reference, estimate and 95% CI: a) 1.95 (95% CI: 1.4-2.6), b) 2.03 (95% CI: 1.5-2.7).
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Hazard ratio (HR) showing recovery, long duration reference, estimate and 95% CI: a) 1.95 (95% CI: 1.4-2.6), b) 2.03 (95% CI: 1.5-2.7).
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3 C: Time point for an event during the pain course
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The time point of change in the course of pain = Event
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Spline regressions, the event defined as the intersection of linear regression lines (the knot).
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Short duration: knot at 4.5 weeks Long duration: knot at 5.9 weeks
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Short duration: knot at 4.4 weeks Long duration: knot at 5.8 weeks
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