Table 3.
Measurement error structure for log total sugars intake and log total sugars density assessed by FFQ, 24HR, and 4DFR among NPAAS (2007–2009) participants (primary study, n = 450; reliability study, n = 88)
Variance of true intake ( ) | Instrument | Slope in regression of reported on true intake (βQ1, βF1, or βR1) | Variance of person-specific bias ( ,  , or  ) | Correlation of person-specific bias with FFQ person-specific bias ( or  ) | Variance of within-person error ( , or  ) | |
|---|---|---|---|---|---|---|
| Total sugars intake, g/d | 0.26 (0.07) | FFQ | 0.21 (0.09)a | 0.15 (0.02) | 0.06 (0.01) | |
| 4DFR | 0.20 (0.08) | 0.07 (0.01) | 0.62 (0.07) | 0.06 (0.01) | ||
| 24HR | 0.20 (0.08) | 0.07 (0.01) | 0.63 (0.07) | 0.16 (0.01) | ||
| Total sugars density, g/1,000 kcal | 0.23 (0.07) | FFQ | 0.21 (0.08) | 0.06 (0.01) | 0.03 (0.01) | |
| 4DFR | 0.14 (0.07) | 0.05 (0.01) | 0.84 (0.07) | 0.04 (0.01) | ||
| 24HR | 0.22 (0.08) | 0.04 (0.01) | 0.70 (0.08) | 0.11 (0.01) |
NOTE: All the parameters were estimated using FFQ-, 24HR-, and 4DFR measurement errors models adjusted for BMI and age and biomarker measurement errors model adjusted for age.
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↵aSE (all values in parentheses).