Table 7.

Number of Participants per Study.

Group size	Number of studies	Group size	Number of studies
1–10	17	100–200	11
10–20	25	200–300	6
20–30	24	400–500	1
30–40	15	500–600	1
40–50	14	Total	19
50–60	7
60–70	4	Articles	131
70–80	1
80–90	3
90–100	2
Total	112