Table 2.

Overall rating and quality of evidence for the content validity of each instrument.^a

Instrument	Relevance		Comprehensiveness		Comprehensibility
	Overall rating	Quality of evidence	Overall rating	Quality of evidence	Overall rating	Quality of evidence
eHEALSb	±	Low	−	Very low	+	Moderate
eHEALS-Ec	±	Moderate	+	Very low	±	Very low
e-HLSd	+	Low	+	Low	+	Low
DHLIe	+	Low	+	Very low	+	Very low
eHLAf	+	Low	+	Low	+	Low
eHLQg	+	Low	+	Low	+	Low
TeHLIh	+	Low	+	Very low	+	Low

^aSufficient (+), insufficient (−), and inconsistent (±).

^beHEALS: eHealth literacy scale.

^ceHEALS-E: eHealth literacy scale-extended.

^de-HLS: electronic health literacy scale.

^eDHLI: digital health literacy instrument.

^feHLA: eHealth literacy assessment toolkit.

^geHLQ: eHealth literacy questionnaire.

^hTeHLI: transactional eHealth literacy instrument.