Table 5.

Estimates of attenuation factors and correlations with truth for the time-varying and fixed-intake models without covariates (standard errors in parentheses): protein intake among women

		Time-varying intake model		Fixed-intake model
Instrument	Study	Attenuation Factor	Correlation with Truth	Attenuation Factor	Correlation with Truth
FFQa	1	0.161 (0.045)	0.302 (0.085)	0.139 (0.039)	0.291 (0.080)
	2	0.039 (0.056)	0.069 (0.099)	0.031 (0.047)	0.057 (0.086)
	3	0.168 (0.043)	0.288 (0.072)	0.187 (0.047)	0.292 (0.071)
	4	0.231 (0.032)	0.410 (0.054)	0.218 (0.031)	0.424 (0.056)
	5	0.188 (0.028)	0.397 (0.058)	0.186 (0.028)	0.398 (0.057)
	Weighted Mean	0.180 (0.017)	0.336 (0.032)	0.169 (0.016)	0.329 (0.030)
	pd	0.052	0.029	0.015	0.005
1 × 24HRb	1	0.137 (0.038)	0.241 (0.065)	0.121 (0.034)	0.238 (0.063)
	2	0.179 (0.032)	0.311 (0.049)	0.189 (0.035)	0.337 (0.056)
	3	0.194 (0.024)	0.348 (0.040)	0.283 (0.032)	0.466 (0.042)
	4	0.304 (0.039)	0.531 (0.071)	0.304 (0.040)	0.584 (0.076)
	5	0.207 (0.025)	0.341 (0.039)	0.229 (0.027)	0.381 (0.040)
	Weighted Mean	0.201 (0.015)	0.340 (0.025)	0.222 (0.015)	0.397 (0.023)
	p	0.029	0.036	0.002	0.002
4 × 24HRc	1	0.295 (0.072)	0.354 (0.087)	0.282 (0.078)	0.363 (0.094)
	2	0.330 (0.053)	0.422 (0.061)	0.375 (0.065)	0.475 (0.074)
	3	0.365 (0.040)	0.477 (0.049)	0.561 (0.057)	0.657 (0.051)
	4	0.456 (0.053)	0.650 (0.064)	0.565 (0.079)	0.797 (0.090)
	5	0.389 (0.039)	0.468 (0.047)	0.472 (0.053)	0.547 (0.055)
	Weighted Mean	0.376 (0.026)	0.476 (0.031)	0.463 (0.029)	0.580 (0.030)
	p	0.264	0.022	0.019	0.003

^aFood frequency questionnaire

^bSingle 24-hour recall

^cAverage of 4 repeats of a 24-hour recall

^dp-value for heterogeneity across studies