- Design
- Analysis of three harmonised ageing cohorts with mediation analysis and a meta-analysis
- Population
- 19,310 middle-aged and older adults in China, the United States and England
- Primary outcome
- Depressive symptoms (CES-D) by dual sensory impairment
- Effect
- OR 1.24 (95% CI 1.15 to 1.33) in China, 2.04 (1.78 to 2.31) in the US, 2.40 (1.79 to 3.00) in England; pooled OR 1.73
Researchers analysed three ageing cohorts, the China Health and Retirement Longitudinal Study, the US Health and Retirement Study and the English Longitudinal Study of Ageing, with 19,310 participants in total. Dual sensory impairment was defined from self-reported hearing and vision problems, and depressive symptoms from the CES-D scale.
Dual impairment went with higher odds of depressive symptoms in every cohort: odds ratio 1.24 (95% CI 1.15 to 1.33) in China, 2.04 (1.78 to 2.31) in the United States and 2.40 (1.79 to 3.00) in England. A meta-analysis with earlier cohort studies gave a pooled odds ratio of 1.73. Mediation analysis suggested reduced social engagement (2.31% to 6.35%) and cognitive decline (5.72% to 14.00%) explained part of the link.
Sensory status was self-reported, and the cross-sectional components cannot show direction. The mediation shares are small, so most of the association is unexplained. In India, where uncorrected vision and hearing loss are common in older people, the finding gives a reason to ask about mood.
- Dual sensory impairment went with higher odds of depressive symptoms in all three cohorts.
- Pooled odds ratio was 1.73 in the meta-analysis.
- Social engagement and cognitive decline explained only a small part of the link.
- Sensory status was self-reported.
- Screen older adults with hearing and vision loss for low mood.
Why it matters
Sensory loss is routinely treated as a separate problem from mood, and this links the two.
Don't overread it
Self-reported sensory status and observational cohorts cannot show that correcting sensory loss would relieve depression.
The statistics, in plain English
Mediation percentages of 2% to 14% mean most of the link is not explained by the two pathways tested. Odds ratios differ across cohorts (1.24 to 2.40), so the strength of the link varies by setting or measurement.
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