Table 1.

Measurement tools used for the assessment of caregivers’ health literacy

Characteristics	Newest Vital Sign (NVS)22	Short form of Test of Functional Health Literacy in Adults (S-TOFHLA)22
Skills assessed	Literacy, comprehension, numeracy, application/function, evaluation skills	Literacy, comprehension, numeracy evaluation skills
N items	7	40
Time to be administered	5 min	12 min
Administration mode	Face-to-face interview	Self-administered (paper and pencil) with the support of the interviewer
Description	It is based on the information presented on a nutritional label, printed on a separated sheet, that the caregiver consults during the test administration, and on 7 questions whose answers have to be deduced from the nutritional label	It is divided into two sections. The first one includes four verbal numeracy questions, requiring interpretation of medication instructions, medical test results and an appointment date. The second section includes 36 close-type items regarding the preparation for a radiological examination (passage A) and a health administrative rights management section (passage B)
Scoring and classification	The final score is calculated as the number of correct answers (from 0 to 6) and classifies the subjects into one of three categories: high likelihood of limited HL (score: 0–1); possibility of limited HL (score: 2–3); and adequate HL (score: 4–6)	To each item of the numeracy section, a score of 7 was assessed for correct answer, giving a total of a maximum potential score of 28. For the second section, a score of 2 was assigned to each correct answer, reaching a maximum potential score of 72. The final score was calculated by summing the partial scores of the two sections, and ranged from 0 to 100. According to the final score, three levels of HL were identified: inadequate (0–53), marginal (54–66) and adequate (67–100)