Fig. 2

Temporal course of the WBQ from assessment points pretreatment (week 0) to post follow-up (week 59). The line in bold denotes the estimated trendline of the WBQ from the discontinuous multilevel model with turning points set at week 2 and week 11. The values were back-transformed from ln(x + 1). The thin line connects the arithmetic mean of the observed values of the WBQ being present at the different assessment points. These values were first transformed using ln(x + 1), averaged and then back-transformed again to make them comparable to the predicted means form the model-based values. Shaded areas denote ± 1 standard error of the trend lines from the discontinuous multilevel model. Waiting-time: week 0 to week 2, active treatment: week 2 to week 11, follow-up: week 11 to week 59