Table 6.

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

		Time-varying intake model		Fixed-intake model
Instrument	Study	Attenuation Factor	Correlation with Truth	Attenuation Factor	Correlation with Truth
FFQa	1	0.411 (0.067)	0.449 (0.069)	0.425 (0.070)	0.470 (0.070)
	2	0.479 (0.160)	0.378 (0.124)	0.427 (0.148)	0.339 (0.111)
	3	0.418 (0.094)	0.342 (0.075)	0.418 (0.093)	0.331 (0.069)
	Weighted Mean	0.420 (0.052)	0.396 (0.048)	0.423 (0.052)	0.390 (0.045)
	pd	0.927	0.551	0.998	0.321
1 × 24HRb	1	0.248 (0.038)	0.414 (0.057)	0.252 (0.037)	0.425 (0.055)
	2	0.187 (0.051)	0.244 (0.062)	0.206 (0.055)	0.271 (0.064)
	3	0.258 (0.042)	0.303 (0.045)	0.328 (0.045)	0.372 (0.044)
	Weighted Mean	0.240 (0.025)	0.328 (0.032)	0.266 (0.026)	0.365 (0.031)
	p	0.438	0.132	0.206	0.187
4 × 24HRc	1	0.457 (0.058)	0.562 (0.063)	0.538 (0.080)	0.621 (0.076)
	2	0.514 (0.121)	0.404 (0.091)	0.597 (0.145)	0.461 (0.101)
	3	0.529 (0.078)	0.433 (0.058)	0.709 (0.089)	0.546 (0.058)
	Weighted Mean	0.481 (0.048)	0.483 (0.042)	0.612 (0.055)	0.554 (0.042)
	p	0.711	0.229	0.362	0.435

^aFood frequency questionnaire

^bSingle 24-hour recall

^cAverage of 4 repeats of a 24-hour recall

^dp-value for heterogeneity across studies