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Table 2 Type of calibration study with typical design and information to be extracted

From: Study protocol: the empirical investigation of methods to correct for measurement error in biobanks with dietary assessment

Type of calibration study Typical design Relevant information to extract
Reliability study • Employs a comparison of several instruments to estimate dietary intake one of which may be a "gold-standard"
• Uses a sub-sample of subjects from the main study or an external sample
• Number of instruments used
• Number of subjects
• Were biochemical markers used?
• Was the sub-sample from main study or an external sample?
Validation study • Employs a "gold-standard" compared with another instrument used to estimate dietary intake
• Uses a sub-sample of subjects from the main study or an external sample
• Number of instruments used
• Number of subjects
• What was the "gold-standard" (biochemical marker/other instrument)?
• Was the sub-sample from main study or an external sample?
Reproducibility study • Employs replicate measurements for an instrument used to estimate dietary intake
• Uses a sub-sample of subjects from the main study or an external sample
• Instrument used
• Number of subjects
• Number of repeat measures used,
• Spacing of repeat measures,
• Were biochemical markers used?
• Was the sub-sample from main study or an external sample?