Table 2.

Characteristics for those with and without onset of major depressive disorder at 6 or 12 months of follow-up.

	Total (N = 6910) %	No onset (N = 6321) %	Onset (N = 589) %	OR (95% CI)
Socio-demographic
Age in years, tertiles
18 to 40	33	34	28	1 (ref)
41 to 57	34	33	43	1.56 (1.27 to 1.92)⁎
58 to 75	33	34	29	1.02 (0.82 to 1.27)
18 to 29	15	15	11	1 (ref)
30 to 39	17	17	15	1.30 (0.93 to 1.81)
40 to 49	19	18	23	1.81 (1.33 to 2.47)⁎
50 to 59	21	21	25	1.69 (1.25 to 2.30)⁎
60 to 69	20	20	18	1.23 (0.89 to 1.70)
70 to 75	9	10	8	1.10 (0.74 to 1.64)
Female	68	66	80	2.00 (1.62 to 2.46)⁎
Education (lower)a	41	39	55	1.89 (1.59 to 2.24)⁎
Country
UK	14	14	14	1 (ref)
Spain	10	10	18	1.83 (1.34 to 2.49)⁎
Slovenia	13	14	7	0.46 (0.31 to 0.68)⁎
Estonia	12	12	8	0.66 (0.46 to 0.96)⁎
Netherlands	14	14	8	0.57 (0.39 to 0.82)⁎
Portugal	12	12	12	0.95 (0.68 to 1.33)
Chile	25	24	33	1.35 (1.03 to 1.78)⁎
Life events—number
No	41	42	28	1 (ref)
One	30	30	30	1.48 (1.18 to 1.84)⁎
Two or more	29	28	42	2.29 (1.87 to 2.82)⁎
Life events—groupsb
Personal problems	14	14	21	1.73 (1.40 to 2.13)⁎
Relational problems	38	37	46	1.46 (1.23 to 1.73)⁎
Work/financial problems	14	13	21	1.83 (1.48 to 2.26)⁎
Events in family/friends	20	19	31	1.90 (1.56 to 2.31)⁎
Problems with law	8	8	12	1.60 (1.22 to 2.09)⁎

OR = Odds ratio, CI = Confidence intervals.

Percentages may not add up to 100% due to rounding.

^aLower education was defined as primary school, trade or no education. Higher education (the reference category) was defined as secondary school or higher.

^bAbsence of the life event for each group is the reference category (e.g. for the life event group of personal problems, no personal problems is the reference category).

^⁎P < 0.05.