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