In the next step, the titles of these potentially relevant documents were screened and the documents with titles that appeared relevant for the present umbrella review were further reviewed. We included documents which aimed at (1) reviewing good practices or (2) providing an overview of characteristics of good practices, or (3) formulating practice recommendations in interventions or policies promoting healthy diet, physical activity, or a reduction of sedentary behavior. Only documents developed (or officially endorsed) by a respective stakeholder were included. Documents were excluded if they presented selected examples of good practice in interventions/policies or if they did not focus on the characteristics of interventions/policies. Moreover, we excluded documents aiming at interventions or policies focusing on other main outcomes than physical activity, sedentary behaviors or diet (e.g., osteoporosis prevention). These steps were conducted by 2 researchers (MH and MvdB).
Next, the quality of the documents was evaluated. The quality criteria were based on MQC criteria [18], with a 6-item scale and total scores ranging from 0 to 6 (see Additional file 1). Two researchers (MH, MvdB) independently rated all stakeholders’ documents. Papers scoring ≥ 4, that is representing high or moderate quality, were included into the further analyses. The concordance of the quality evaluation was very high, with κ = 1.00, p < .001.
Overall, we obtained 15 non-peer-reviewed stakeholder documents, meeting all inclusion criteria. However, 5 out of 15 documents presented a major overlap with another document issued by the same stakeholder; such documents were excluded (i.e., the excluded document did not report any additional practices compared to the included document). Thus, 10 documents were used for further analyses.
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