Table 6.

Validity Coefficients^a Showing Correlations With True Physical Activity for Physical Activity as Estimated From the Second Physical Activity Questionnaire, the ACT24, Accelerometry, and Doubly Labeled Water–Determined Physical Activity Level in the Men’s Lifestyle Validation Study (n = 516), Boston, Massachusetts, 2011–2013^b

				Validity Coefficient
Variable	Spearman’s Correlation Coefficient c			Q-T		R-T		M-T
	r QR	r QM	r RM	VC QT	95% CI	VC RT	95% CI	VC MT	95% CI
Q = PAQ 2
Total activity	0.40	0.42	0.47	0.60	0.52, 0.68	0.68	0.61, 0.75	0.70	0.62, 0.78
MVPA	0.37	0.45	0.34	0.69	0.61, 0.79	0.53	0.45, 0.63	0.64	0.55, 0.75
Vigorous activity	0.29	0.37	0.18	0.76	0.62, 0.93	0.38	0.29, 0.48	0.49	0.38, 0.63
Moderate activity	0.34	0.26	0.32	0.52	0.43, 0.64	0.64	0.53, 0.78	0.50	0.40, 0.62
Q = average ACT24
Total activity	0.38	0.35	0.47	0.53	0.45, 0.63	0.71	0.63, 0.80	0.67	0.58, 0.76
MVPA	0.32	0.36	0.34	0.58	0.49, 0.69	0.55	0.46, 0.66	0.62	0.53, 0.73
Vigorous activity	0.12	0.28	0.18	0.42	0.29, 0.62	0.28	0.19, 0.43	0.65	0.46, 0.92
Moderate activity	0.27	0.24	0.32	0.45	0.36, 0.58	0.60	0.48, 0.75	0.53	0.42, 0.67

Abbreviations: ACT24, Activities Completed Over Time in 24 Hours; CI, confidence interval; DLW, doubly labeled water; MVPA, moderate-to-vigorous physical activity; PAL, physical activity level; PAQ, physical activity questionnaire; VC, validity coefficient.

^a Q = second PAQ adjusted for age or the average of up to 4 ACT24 recalls adjusted for age; R = accelerometer-determined activity adjusted for age and wear time; M = DLW-determined PAL adjusted for age; T = true physical activity.

^b This analysis was restricted to men with 2 accelerometer measurements.

^c Coefficient for correlation between the PAQ 2 or average ACT24 and the accelerometer (r_QR), the PAQ 2 or average ACT24 and DLW PAL (r_QM), or the accelerometer and DLW PAL (r_RM).