CA	Control arm
CG	Control group
CINAHL	Cumulative Index to Nursing and Allied Health Literature
CVI	Content validity index
CVR	Content validity ratio
HL	Health literacy
HLQ	Health Literacy Questionnaire
HLS-EU-Q47	European Health Literacy Survey Questionnaire
IA	Intervention arm
IG	Intervention group
IHLQ	Iranian Health Literacy Questionnaire
LSQ	Lifestyle Questionnaire
MeSH	Medical subjects heading
MHLAPQ	Maternal Health Literacy and Pregnancy Outcome Questionnaire
PICO	PICO question (population/intervention/comparation/outcome)
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PROSPERO	International prospective register of systematic reviews
RCT	Randomized clinical trial
REALM	Rapid Estimate of Adult Literacy in Medicine
RoB2	Risk of Bias tool version 2
SILS	Single Item Literacy Screener test
S-TOFHLA	Short version of the Test of Functional Health Literacy in Adults
WHO	World Health Organization