Table 1 Summary of general characteristics of included systematic reviews

Year of publication [median (range)]

2020 (2019–2020)

Literature search date [median (range)]

2019 (2018–2020)

Included study designs [median (range)]

8 (5–14)

 Randomized controlled trials [median (range)]

2 (1–5)

 Observational studies [median (range)]

6 (0–11)

Overall sample size [median (range)]

3260 (1408–7603)

Meta-analysis [N (%)]

11(79)