Table 2. Rate of suicide for the study population and for subgroups in the study population.

Subgroup	Number of suicides	Exposure time (number of person-years)	Suicides per 100,000 person-years	Rate ratio compared to 1st category	95% confidence interval of rate ratio
Whole population	227	1,961,247	11.57
Gender
Male	214	1,575,434	13.58	1.00
Female	13	385,813	3.37	0.25	(0.19-0.33)
Age group (in quartiles)
≤23.4	75	477,842	15.70	1.00
>23.4 and ≤27.9	57	475,635	11.98	0.76	(0.64-0.91)
>27.9 and ≤35.5	43	485,280	8.86	0.57	(0.47-0.68)
>35.5	52	522,491	9.95	0.63	(0.53-0.76)
Marital status
Single	82	658,558	12.45	1.00
Married	119	1,175,599	10.12	0.81	(0.71-0.94)
Divorced or widowed	26	127,090	20.46	1.64	(1.32-2.05)