Table 5. Comparison of one-year interval reproducibility indices of Japanese short food frequency questionnaires.

Authors	Year	No. of food items	Sex	n	Median (range) of Spearman’s rank CCs
					Food groups	Nutrients
Ogawa K et al11	2003	40	Male	55	0.50 (0.30-0.70)	0.49 (0.31-0.71)
			Female	58	0.57 (0.39-0.66)	0.50 (0.40-0.64)
Sasaki S et al12	2003	44	Male	101	0.50 (0.38-0.71)	0.49 (0.30-0.82)
			Female	108	0.49 (0.30-0.74)	0.50 (0.32-0.68)
Ishihara J et al13	2003	44	Male	143	0.51 (0.33-0.72)	0.57 (0.39-0.77)
			Female	146	0.50 (0.40-0.80)	0.54 (0.38-0.70)
Present study (2007)	2007	47	Male	844	0.65 (0.57-0.80)	0.66 (0.55-0.74)
			Female	1,074	0.60 (0.69-0.54)	0.62 (0.54-0.73)

CC: correlation coefficient