Table 2.

Multivariate logistic regression of the odds ratios (95% confidence interval) for the incidence of depressive symptoms by tertiles of seaweed intakes at baseline (n = 500)

	Tertiles of seaweed intakes at baseline			p for trend
	Tertile 1	Tertile 2	Tertile 3
Range, g/1000 kcal/day	0, 2.9	2.9, 7.3	7.3, 46.1
No. of participants	167	167	166
No. of participants with depressive symptoms	10	21	15
Model 1a	1.00 (ref)	2.23 (0.99–5.01)	1.72 (0.73–4.09)	0.226
Model 2b	1.00 (ref)	2.27 (0.99–5.19)	1.75 (0.72–4.22)	0.229
Model 3c	1.00 (ref)	2.51 (1.07–5.93)	1.51 (0.61–3.77)	0.399
Model 4d	1.00 (ref)	2.43 (1.02–5.82)	1.41 (0.55–3.65)	0.501

^aAdjusted for baseline Self-rating Depression Scale, sex, log age, and log body mass index

^bSame as Model 1 + occupation (desk work), education level (≥college), and living status (alone)

^cSame as Model 2 + smoking status (current, former, never), alcohol use frequency (every day, sometimes, never), breakfast skipping (≥3 times/week), physical activity (0, 0.1–22.9, ≥ 23 metabolic equivalent hours/week), and metabolic syndrome

^dSame as Model 3 + log intakes of protein, green leafy vegetables, and fish