Table 3. Odds ratio of depression according to quartiles of fish intake (g per 1000 kcal) by the lung cancer patients (n=771).

		HADS-Da		Odds ratio
		⩽4	⩾5	Crude	Adjusted for age and sex	Multivariateb
Quartile	Median intake (g per 1000 kcal)	n (%)	n (%)	(95% Clc)
q1	20.5	77 (40.1)	115 (59.9)	1.00	1.00	1.00
q2	32.3	80 (41.5)	113 (58.5)	0.95 (0.63–1.42)	0.94 (0.62–1.42)	0.96 (0.62–1.50)
q3	44.4	87 (45.1)	106 (54.9)	0.82 (0.54–1.22)	0.81 (0.54–1.21)	0.79 (0.51–1.23)
q4	67.0	91 (47.2)	102 (52.8)	0.75 (0.50–1.12)	0.73 (0.49–1.11)	0.81 (0.52–1.26)
P for trend				0.127	0.107	0.285

^aHADS-D: Depression subscale of the Hospital Anxiety and Depression Scale.

^bAdjusted for age, sex, performance status, clinical stage, histology, pain, breathlessness, employment, smoking, alcohol consumption, and body mass index as covariates.

^c95% confidence interval.