Data quality in centenarian research: The proxy-centenarian relationship and item nonresponse in the SWISS100 study.

being children of the centenarian), they did not reach statistical significance without or with control variables (no control [M0]: OR = 1.84, 95% CI [0.44–7.77]; proxy characteristics as controls [M1]: OR = 2.94, 95% CI [0.55–15.70]; centenarian’s characteristics as controls [M2]: OR = 1.97, 95% CI [0.43–8.91]; proxy behaviour during interview as control [M3]: OR = 2.26, 95% CI [0.50–10.18]; data collection features [M4]: OR = 1.98, 95% CI [0.43–9.15]).

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While not statistically significant, our results showed a trend in line with expectations that centenarians who would have been excluded without the opportunity to participate through a proxy respondent tended to exhibit poorer physical and mental health.

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