Table 1.

Associations of intelligence (IQ) and emotional control (EC) in 1969/1970 with suicidal behavior 1973–2008

	N	Events	(%)	HR†/OR§	95% CI
(a) IQ, unitsa
1	4519	326	(7.21)	6.29†	4.48–8.83
2	11 695	552	(4.72)	4.02†	2.89–5.60
3	17 058	552	(3.24)	2.72†	1.96–3.79
4	12 292	257	(2.09)	1.75†	1.24–2.46
5	3174	38	(1.20)	1.00†	–
(b) IQ, per unit decrease
1973–2008	48 738	1725	(3.54)	1.54†	1.46–1.61
1973–1979	48 738	416	–	1.65§	1.49–1–82
1980–1989	48 401	619	–	1.57§	1.45–1.70
1990–1999	47 907	525	–	1.56§	1.43–1.70
2000–2008	46 728	408	–	1.53§	1.39–1.69
(c) EC, unitsa
1	3070	290	(9.45)	6.64†	4.75–9.28
2	11 786	598	(5.07)	3.46†	2.50–4.78
3	19 579	555	(2.83)	1.92†	1.38–2.65
4	11 598	243	(2.10)	1.43†	1.02–2.01
5	2705	39	(1.44)	1.00†	–
(d) EC, per unit decrease
1973–2008	48 738	1725	(3.54)	1.68†	1.60–1.76
1973–1979	48 738	416	–	2.17§	1.95–2.40
1980–1989	48 401	619	–	1.84§	1.69–2.00
1990–1999	47 907	525	–	1.58§	1.45–1.73
2000–2008	46 728	408	–	1.44§	1.30–1.59

Parts a and c: Hazard ratios (HRs; marked with ‘^†’) with 95% confidence intervals (CIs) for the entire follow-up period, modelling IQ and EC as categorical variables. Parts b and d: HRs for the entire follow-up and odds ratios (ORs; marked with ‘^§’) for the separate time periods, with 95% CIs, modelling IQ and EC as continuous variables. All models are adjusted for childhood SES.

^aOne (1) represents the lowest level and five (5) the highest level of intelligence and emotional control. Level 5 is the reference category in these analyses (HR = 1)