TABLE 2.

Descriptive characteristics of the studies.

Study	N	Ages	P	TW	NS	LS	TM	DV
1	E: 15 C: 15	B	Cli	F	3	30	Fo	Psy, Phy, Func
2	E: 8 C: 7	A	Cli	S	3	20	Po, Fo	Psy
3	E: 11 C: 11	C	Cli	F	3	20	Po	Psy
4	E: 31 C: 29	C	Cli	F	1	NR	Po	Psy
5	E: 15 C: 15	A	Cli	F	3	30	Po, Fo	Psy, func
6	E: 11 C: 11	C	Cli	F	5	25	Po, Fo	Psy, func
7	E: 38 C: 42	B	Gen	S	6	25	Po	Psy
8	E: 23 C: 23	B	Cli	S	3	NR	Po, Fo	Psy
9	E: 13 C: 11	C	Gen	F	3	20	Po, Fo	Psy, Phy, Func
10	E: 23 C: 23	C	Cli	F	4	15	Po, Fo	Psy, Phy
11	E: 15 C: 15	A	Cli	F	3	30	Po, Fo	Psy, Phy, Func
12	E: 18 C: 18	C	Cli	F	1	30	Po, Fo	Psy, Phy, Func
13	E: 15 C: 15	A	Cli	S	3	20	Po, Fo	Psy
14	E: 28 C: 28	C	Gen	F	14	NR	Po	Psy
15	E: 16 C: 16	C	Cli	S	4	30	Po	Psy, Func
16	E: 46 C: 17	C	Cli	F	3	10	Po, Fo	Psy,
17	E: 6 C: 5	C	Cli	S	4	20	Po, Fo	Psy, Func
18	E: 31 C: 30	B	Gen	S	14	50	Po, Fo	Psy,
19	E: 11 C: 14	C	Gen	F	3	20	Po, Fo	Psy, Phy, Func
20	E: 30 C: 30	C	Cli	S	3	15	Po	Psy
21	E: 16 C: 15	C	Cli	S	4	20	Po, Fo	Psy
22	E: 12 C: 12	C	Cli	F	4	20	Po	Psy
23	E: 10 C: 7	C	Cli	S	4	20	Po, Fo	Psy
24	E: 12 C: 13	C	Gen	S	8	20	Po, Fo	Psy
25	E: 48 C: 48	C	Gen	S	6	20	Po, Fo	Psy, Func
26	E: 26 C: 24	C	Cli	F	3	30	Po	Psy
27	E: 64 C: 71	B	Gen	F	3	30	Po	Psy, Phy
28	E: 18 C: 16	C	Cli	S	4	20	Po	Psy
29	E: 30 C: 31	C	Gen	S	3	30	Po, Fo	Psy, Func

Age (A: under 13, B: 13–19, C: above 19), N: number of participants (E: experiment group, C: Control group), P: the type of population (Cli: Clinical population, Gen: General population); TW, type of writing (F: Free writing, S: structured writing); NS, number of sessions; LS, length of sessions in minutes (NR: Not reported); TM, timing of measuring (po: posttest, Fo: Follow-up test) post (1) follow-up (2); DV, dependent variable (Psy: psychological health, Phy: physical health, Func: general functioning).