Table 3. Serum phospholipid fatty acid level (% of TFA¹) in men by area.

	Ninohe PHC area			Yokote PHC area			Saku PHC area			Ishikawa PHC area			ANOVA P-value
	Mean	± SD	Median	Mean	± SD	Median	Mean	± SD	Median	Mean	± SD	Median
	n=22			n=25			n=19			n=22
SFA1	46.3	± 3.6	45.9	48.8	± 2.5	49.1	46.9	± 2.4	46.9	47.3	± 1.6	47.0	0.015
14:0	0.4	± 0.1	0.4	0.4	± 0.1	0.4	0.5	± 0.3	0.5	0.3	± 0.2	0.4	0.082
16:0	28.2	± 2.4	28.6	29.8	± 2.4	29.5	28.7	± 1.5	28.8	28.0	± 2.5	27.3	0.029
18:0	14.8	± 2.0	14.4	15.3	± 1.0	15.3	14.6	± 2.0	14.1	15.6	± 1.5	15.7	0.181
MUFA1	12.7	± 1.8	12.1	13.8	± 1.1	13.8	13.6	± 1.4	13.2	14.2	± 1.8	13.7	0.015
16:1	0.6	± 0.3	0.5	0.6	± 0.2	0.6	0.5	± 0.2	0.5	0.7	± 0.4	0.6	0.489
18:1	8.1	± 1.3	7.7	8.8	± 1.0	8.6	9.1	± 1.1	8.9	9.2	± 1.5	8.8	0.013
PUFA1	40.9	± 4.2	42.4	37.2	± 2.7	37.4	39.5	± 3.2	40.5	38.4	± 2.2	39.0	0.001
n-3 PUFA	14.4	± 3.2	14.5	13.4	± 2.8	13.8	12.5	± 2.7	12.4	9.0	± 1.4	8.7	0.000
18:3n-3	0.3	± 0.1	0.2	0.2	± 0.2	0.2	0.2	± 0.1	0.3	0.2	± 0.2	0.2	0.950
20:5n-3	4.5	± 1.5	4.6	4.5	± 1.5	4.4	3.3	± 1.1	3.2	2.1	± 0.8	2.0	0.000
22:5n-3	1.5	± 0.3	1.5	1.2	± 0.3	1.1	1.3	± 0.3	1.4	0.8	± 0.1	0.8	0.000
22:6n-3	8.1	± 1.8	8.2	7.5	± 1.5	7.4	7.6	± 1.8	7.7	5.9	± 0.8	5.8	0.000
n-6 PUFA	26.5	± 3.0	26.7	23.8	± 3.8	23.7	27.0	± 2.6	27.4	29.3	± 2.3	29.3	0.000
18:2n-6	17.8	± 2.9	17.8	15.6	± 3.4	14.9	18.0	± 2.8	18.5	18.4	± 2.4	18.8	0.005
20:3n-6	1.7	± 0.3	1.7	1.5	± 0.3	1.5	1.7	± 0.5	1.8	2.1	± 0.5	2.0	0.000
20:4n-6	5.8	± 1.3	5.5	6.0	± 1.0	6.0	6.0	± 1.1	5.9	7.9	± 1.2	7.8	0.000
n-6/n-3 ratio	2.0	± 0.5	2.0	1.9	± 0.7	1.7	2.3	± 0.6	2.2	3.4	± 0.7	3.4	0.000
n-3/20:4n-6 ratio	2.6	± 0.6	2.5	2.4	± 0.7	2.2	2.2	± 0.6	1.9	1.1	± 0.3	1.1	0.000
PUFA/SFA ratio	0.9	± 0.1	0.9	0.8	± 0.1	0.8	0.8	± 0.1	0.9	0.8	± 0.1	0.8	0.001

¹TFA, total fatty acid; SFA, saturated fatty acid; MUFA, monounsaturated fatty acid;. PUFA, polyunsaturated fatty acid.