. 2018 Jan 13;10(1):84. doi: 10.3390/nu10010084

Table 1.

Test-retest reproducibility of the frequency of protein-rich food intakes assessed by the present food frequency questionnaire in 227 older men and 221 older women.

Food Frequency (Times/Day)	Men					Women
		Survey 1	Survey 2	p-Value	r		Survey 1	Survey 2	p-Value	r
	n	Mean ± SD		p-Value	r	n	Mean ± SD		p-Value	r
Animal food
Seafood	190	1.70 ± 1.06	1.65 ± 1.07	0.529	0.54^*	180	1.89 ± 1.26	1.67 ± 0.88	0.018	0.42^*
Meat	201	0.90 ± 0.65	0.97 ± 0.76	0.106	0.63^*	194	0.95 ± 0.56	0.98 ± 0.54	0.519	0.54^*
Dairy products	187	0.86 ± 0.77	1.00 ± 0.86	0.012	0.56^*	187	1.20 ± 0.92	1.33 ± 0.97	0.024	0.66^*
Egg	219	0.58 ± 0.44	0.56 ± 0.39	0.301	0.54^*	217	0.59 ± 0.36	0.59 ± 0.37	0.879	0.53^*
Soy products	197	1.76 ± 1.21	1.62 ± 1.15	0.074	0.56^*	189	1.98 ± 1.12	1.93 ± 1.30	0.533	0.57^*

First survey was conducted in February 2012 and second survey was conducted in September 2012. SD = standard deviation; r = correlation coefficients assessed by pairwise correlation coefficient; the differences between Frequency 1 and Frequency 2 assessed by the paired t-test; * p-value < 0.001.