Table 5.

Measurements of metacognitive beliefs about worry and meta-worry

Measure	Items	Scales	Answer format	Values for reliability	Age	k
MCQ-C	24	4	Do not agree (1) to agree very much (4)	POS: α = 0.46 - 0.89, rtt = 0.82; NEG: α = 0.60 - 0.95, rtt = 0.76[25-28,49,51,52,57,64,65,72,73,74,78]	7-17	22
MCQ-A	30	5	Do not agree (1) to agree very much (4)	POS: α = 0.80 - 0.90, rtt = 0.66; NEG: α = 0.80 - 0.87, rtt = 0.71[24,53,54,81,82]	11-17	9
MCQ-C30	30	5	Not at all (1) to completely (4)	POS: α = 0.64 - 0.73; NEG: α = 0.71 - 0.79[23,76,93]	7-17	8
MCQ-30	30	5	Do not agree (1) to agree very much (4)	POS: α = 0.88; NEG: α = 0.77[67]	15-18	3
MCQ-CR	30	5	Not true (1) to Very true (4); I do not understand	POS: α = 0.77; NEG: α = 0.80[30]	7-12	1
MKF-K	30	4	Not at all (1) to completely (4)	POS: α = 0.73; NEG: α = 0.70[68]	7-14	1
MWQ	7	2	Never (1) to almost always (4)	α = 0.80 - 0.82[73]	11-18	1
WW-II	25	5	Not at all (0) to incapacitating (4)	α = 0.90[71]	7-18	1
Interview	2	2	Open questions	κ = 0.61[70]	6-10	1

α: Cronbach’s Alpha; rtt: Test-retest-reliability; κ: Cohen’s kappa; k: Number of included studies which used the measure; MCQ-30: Metacognitions Questionnaire - 30-Item Version; MCQ-A: Metacognitions Questionnaire - Adolescent Version; MCQ-C: Metacognitions Questionnaire for Children; MCQ-CR: Revised Metacognitions Questionnaire for Children; MCQ-C30: Metacognitions Questionnaire for Children - 30 Item version; MKF-K: Metacognition questionnaire for children; MWQ: Meta-Worry Questionnaire; WW-II: Why Worry-II; POS: Positive beliefs about worry; NEG: Negative beliefs about worry.