Table 1.

Participants’ characteristics of the selected studies (n=19).

Study	Country	Setting	Sample size, n	Sex (female/male), n/n	Age (years), mean (range)a
Azami et al [28]	Iran	Participants’ home	34	0/34	7-12
Benzing and Schmidt [27]	Switzerland	Participants’ home	51	10/41	10.43 (8-12)
Bigorra et al [32]	Spain	Participants’ home	66	36/24	8.9
Bikic et al [24]	Denmark	Participants’ home	70	11/59	9.96
Bioulac et al [33]	France	No mention	51	10/41	8.9
Breider et al [30]	Netherlands	Participants’ home	21	6/15	7.76
Corkum et al [41]	Canada	Classroom-based	58	7/51	8.83 (6-12)
Dovis et al [19]	Netherlands	Home-based training	89	18/71	10.50
Egeland et al [21]	Norway	School	67	18/49	10.4
Fried et al [44]	The United States	Participants’ home	333	88/245	9.13
Gevensleben et al [42]	Germany	No mention	94	17/77	9.21
Kofler et al [25]	The United States	Office and participants’ home	54	12/42	10.41
Kollins et al [43]	The United States	Participants’ home	348	100/248	9.65
Lim et al [29]	Singapore	Clinic	172	25/147	8.6
Meyer et al [26]	The United States	Home	40	12/28	10.15
Moreno-García et al [20]	Spain	Home and school	57	13/44	8.84
Steiner et al [22]	The United States	Classroom	104	34/70	8.56
van der Oord et al [23]	Netherlands	Home	40	7/33	9.75
Wangler et al [31]	Germany	No mention	94	17/77	9.64

^aIf studies did not provide mean values and/or ranges for participant ages, this information was not shown in the table.