Table 2:

Yates Quality Rating Scale (YQRS)[62] of Studies Evaluating Mindfulness for Migraine

Yates Quality Rating Scale Details		Studies Included
Items	Options	Wells 2014 [83]	Seng 2019 [79]	Day 2014 [85]	Simshäuser 2019 [82]	Tavallaei 2018 [86]	Bakhshani 2015 [87]	Hesse 2015 [88]	Grazzi 2017 [80]
Treatment quality
Treatment content and setting	0, 1, 2	2	2	2	2	1	1	2	1
Treatment duration	0, 1	1	1	1	1	0	1	1	0
Manualization	0, 1, 2	2	2	1	2	1	1	1	1
Adherence to manual	0, 1	1	1	1	1	1	1	1	1
Therapist training	0, 1, 2	2	2	2	2	0	0	2	1
Patient engagement	0, 1	1	1	1	1	1	0	1	0
Quality of study design and methods
Sample criteria	0, 1	1	1	1	1	1	1	1	1
Evidence criteria met	0, 1	1	1	1	1	1	1	1	1
Attrition	0, 1, 2	2	2	2	1	1	1	1	1
Rates of attrition	0, 1	1	1	1	1	1	1	1	1
Sample characteristics	0, 1	1	1	1	1	1	1	1	1
Group equivalence	0, 1	1	1	1	1	1	1	0	1
Randomization	0, 1, 2	2	2	2	2	1	1	0	0
Allocation bias	0, 1	1	1	1	1	1	1	0	0
Measurement bias	0, 1	0	0	0	0	0	0	0	0
Treatment expectations	0, 1	0	0	1	1	0	0	0	0
Justification of outcomes	0, 1, 2	2	2	2	1	1	1	1	1
Validity of outcomes for context	0, 1, 2	2	2	1	1	1	1	1	1
Reliability and sensitivity to change	0, 1, 2	2	2	1	1	1	1	1	1
Follow-up	0, 1	1	1	1	1	0	0	0	1
Power calculation	0, 1	1	1	0	0	0	0	0	0
Sufficient sample size	0, 1	0	0	0	0	0	0	0	0
Planned data analysis	0, 1	1	1	1	1	1	1	1	1
Statistics reporting	0, 1	1	1	1	1	1	1	1	1
Intention-to-treat analysis	0, 1	1	1	1	0	0	0	0	0
Control group	0, 1, 2	1	1	2	1	2	1	0	1
Total score/35		31	31	29	26	19	18	18	17