Table 2.

Risk of depression in participants with early and late chronotypes compared to that in those with intermediate chronotype according to age groups using multivariate analysis.

Age groups, no. of corresponding participants	Intermediate chronotype, no. of depression cases/no. of corresponding participants	Early chronotype, OR and 95% CI, no. of depression cases/no. of corresponding participants	Late chronotype, OR and 95% CI, no. of depression cases/no. of corresponding participants
All participants
Aged 19–40 years, 1,642	REF, 53/3579	1.8 (0.7–5.4), 5/52	1.9 (1.3–3.2), 42/472
Aged 41–59 years, 2,039	REF, 55/1613	2.2 (1.2–4.2), 22/276	3.1 (1.5–6.2), 12/150
Aged 60–80 years, 1,869	REF, 77/848	0.7 (0.5–1.1), 76/999	2.3 (0.8–6.7), 4/22
Women
Aged 19–40 years, 953	REF, 36/667	3.1 (0.9–10.5), 4/26	2.1 (1.1–4.2), 30/260
Aged 41–59 years, 1,196	REF, 36/967	1.9 (0.9–4.0), 14/146	4.6 (2.0–10.7), 8/83
Aged 60–80 years, 1,073	REF, 55/502	0.8 (0.5–1.3), 57/558	3.6 (1.1–11.2), 4/13
Men
Aged 19–40 years, 689	REF, 17/451	0.4 (0.1–4.1), 1/26	1.2 (0.5–3.2), 12/212
Aged 41–59 years, 843	REF, 19/646	3.0 (1.2–7.8), 8/130	1.5 (0.3–7.0), 4/67
Aged 60–80 years, 796	REF, 22/346	2.6 (0.9–7.7), 19/441	–, 0/9*

*No men aged 60–80 years with late chronotype had depression.

OR: odds ratio, CI: confidence internal, No.: number, REF: reference.