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Persons with missing weight data were excluded from the analysis, as were persons who had a proxy answer questions for them, and pregnant women.
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The proxy answers are not frequent among the older people of our sample (5.8%).
* Intraclass correlation † * Mean proxy answers compared to patient answers on the item expressed as the percentage of the full scale points.
The analyses for the current study included children aged 6 17 years whose adult proxy answered the ADHD diagnosis question in the NHIS 2007 survey.
The questionnaire was validated by comparison of 1564 pairs of subject and proxy answers regarding frequency of alcohol consumption, which found a weighted Cohen's kappa coefficient of 0.61, indicating moderate agreement [ 21].
Leukemia patients were significantly more likely than controls to report having used pesticides; the leukemia odds associated with pesticides, however, decreased and were non-statistically significant when proxy answers were used.
Existing variations between self- and proxy-reported data seems reasonable, i.e. that the reason for a proxy answering may be that the respondent's listening performance is poorer, resulting in lower completion of primary education, and, consequently, the respondent remaining unable to read.
Chi-square tests were done to assess the impact of proxies answering the questions on behalf of the respondents.
The control group's answers to the Life Sustaining Preferences Questionnaire LSPQQ) developed by Beland & Froman [ 34] were compared with their proxies' answers to the same questionnaire.
From those interviewed: 95% provided blood sample, 91% had anthropometric measures, and 24% required a proxy to answer the questionnaire.
We chose to include responses provided by proxies for patients unable to answer the questionnaires by themselves although proxy response reliability is lower [ 21].
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