Strengths and Limitations of the Study
WAD
The trial was a multicenter study involving 57 physiotherapists working in primary care clinics in 10 county councils, which enhanced the risk of less control over the delivered interventions. However, the physiotherapists received theoretical and practical training, including written information, and they could contact the project leaders for support when needed. The advantage of the multicenter study is related to the fact that the interventions were delivered by physiotherapists without expert knowledge and skills in WAD and NSE. This may indicate that the results are generalizable and easy to implement in clinical practice. The compliance with exercise was lower in the NSEIT group compared to the NSE group, and further research should establish the individual dosage of exercise and identify individuals in need of a supervised NSE program or other interventions. Further research is also needed to clarify the pathophysiological mechanisms underlying WAD, improve diagnostics, and plan treatment for individuals who do not improve with the NSEs.