Table 3.

Pearson correlations between dietary assessment measures, unadjusted and adjusted for energy intake by the residual method.

Nutrient Measured a	Web-PDHQ/Paper-DHQ n=210	Web-PDHQ/Food recordFood record n=213	Paper DHQ/Food recordFood record n=214	Web-PDHQ/Recalls n=218	Paper DHQ/24-hour. Recalls n=214	Food recordFood Record/24-hour Recall n=217
Energy (kcal)	0.66	0.39	0.30	0.18	0.24	0.56
Protein (g)
Unadjusted	0.69	0.40	0.38	0.33	0.32	0.58
Adjusted	0.40	0.40	0.24	0.45	0.24	0.43
Carbohydrate (g)
Unadjusted	0.67	0.44	0.44	0.24	0.31	0.54
Adjusted	0.29	0.30	0.23	0.38	0.28	0.34
Fat (g)
Unadjusted	0.65	0.37	0.33	0.15	0.21	0.47
Adjusted	0.40	0.39	0.21	0.30	0.14	0.31
Saturated Fat (g)
Unadjusted	0.70	0.44	0.36	0.14	0.18	0.51
Adjusted	0.54	0.56	0.30	0.29	0.16	0.42
Monounsaturated Fat (g)
Unadjusted	0.64	0.34	0.33	0.20	0.20	0.39
Adjusted	0.40	0.36	0.23	0.21	0.09	0.27
Polyunsaturated Fat (g)
Unadjusted	0.63	0.28	0.25	0.16	0.16	0.35
Adjusted	0.38	0.21	0.15	0.10	0.03	0.28
Cholesterol (mg)
Unadjusted	0.72	0.53	0.46	0.30	0.30	0.54
Adjusted	0.65	0.64	0.45	0.44	0.34	0.51
Dietary fiber (g)
Unadjusted	0.78	0.58	0.60	0.48	0.51	0.59
Adjusted	0.65	0.55	0.50	0.57	0.49	0.56
Vitamin A (IU)
Unadjusted	0.81	0.46	0.51	0.36	0.38	0.35
Adjusted	0.73	0.46	0.51	0.40	0.39	0.35
Vitamin A (mcg RE)
Unadjusted	0.79	0.44	0.49	0.31	0.33	0.39
Adjusted	0.69	0.44	0.49	0.37	0.35	0.38
Vitamin E (mg α-TE)
Unadjusted	0.62	0.21	0.26	0.18	0.25	0.40
Adjusted	0.33	0.26	0.25	0.14	0.17	0.37
Vitamin C (mg)
Unadjusted	0.79	0.56	0.54	0.44	0.48	0.63
Adjusted	0.72	0.57	0.53	0.47	0.49	0.63
Thiamin (mg)
Unadjusted	0.73	0.40	0.33	0.35	0.29	0.43
Adjusted	0.47	0.46	0.37	0.37	0.20	0.39
Riboflavin (mg)
Unadjusted	0.74	0.34	0.29	0.33	0.20	0.41
Adjusted	0.54	0.43	0.25	0.43	0.20	0.38
Niacin (mg)
Unadjusted	0.70	0.27	0.28	0.34	0.31	0.35
Adjusted	0.43	0.31	0.23	0.29	0.18	0.28
Folate (mg)
Unadjusted	0.75	0.49	0.42	0.27	0.23	0.37
Adjusted	0.57	0.57	0.37	0.34	0.22	0.36
Vitamin B6 (mg)
Unadjusted	0.76	0.41	0.35	0.42	0.32	0.36
Adjusted	0.46	0.52	0.42	0.46	0.36	0.40
Calcium (mg)
Unadjusted	0.75	0.46	0.37	0.38	0.30	0.52
Adjusted	0.60	0.52	0.44	0.55	0.37	0.60
Iron (mg)
Unadjusted	0.74	0.45	0.40	0.35	0.27	0.40
Adjusted	0.54	0.54	0.39	0.39	0.25	0.35
Magnesium (mg)
Unadjusted	0.72	0.48	0.41	0.44	0.40	0.50
Adjusted	0.51	0.48	0.34	0.48	0.29	0.45
Phosphorous (mg)
Unadjusted	0.71	0.37	0.37	0.35	0.34	0.41
Adjusted	0.46	0.40	0.27	0.42	0.22	0.31
Zinc (mg)
Unadjusted	0.60	0.33	0.32	0.27	0.21	0.25
Adjusted	0.28	0.27	0.22	0.19	0.12	0.17
Potassium (mg)
Unadjusted	0.74	0.54	0.54	0.38	0.42	0.51
Adjusted	0.54	0.47	0.41	0.49	0.38	0.46
Vitamin B12 (mg)
Unadjusted	0.69	0.29	0.28	0.29	0.24	0.25
Adjusted	0.59	0.27	0.26	0.31	0.23	0.23
Sodium (mg)
Unadjusted	0.71	0.36	0.30	0.19	0.19	0.45
Adjusted	0.69	0.44	0.49	0.37	0.35	0.38