ACT	Acceptance and Commitment Therapy
BDI	Beck Depression Inventory
CBT	Cognitive-Behavioral Therapy
CBT-I	Cognitive-Behavioral Therapy–Insomnia
CES-D	Center for Epidemiological Studies Depression Scale
CINAHL	Cumulative Index to Nursing and Allied Health Literature
CP	Chronic Pain
CPG	Chronic Pain Grade
DASS	Depression, Anxiety and Stress Scale
DL	DerSimonian–Laird
GDS	Geriatric Depression Scale
HADS	Hospital Anxiety and Depression Scale
HRSD	Hamilton Rating Scale for Depression
HSCL	Hopkins Symptom Checklist
ISCIPBDS	International Spinal Cord Injury Pain Basic Data Set
MARS	Meta-Analysis Reporting Methods
NRS	Numerical Rating Scale
PHQ	Patient Health Questionnaire
POMS	Profile of Mood States
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PROSPERO	International Prospective Register of Systematic Reviews
RAPS	Rheumatoid Arthritis Pain Scale
RCTs	Randomized Controlled Trials
SE	Standard Error
SF-36	36-Item Short-Form Health Survey
SF-MPQ	Short Form of the McGill Pain Questionnaire
SWiM	Synthesis Without Meta-Analysis
TSSEM	Two-stage structural equation modeling
VAS	Visual Analog Scale
WHYMPI	West-Haven–Yale Multidimensional Pain Inventory
WOMAC	Western Ontario and McMaster University Osteoarthritis Index
ZSDS	Zung Self-rating Depression Scale