Table 1

Distribution of person-years at risk

	SSM		OSM		P value**
	Person-years*	%	Person-years*	%	P value**
Males
Country
Denmark	103 391	62.5	12 383 124	47.6	χ² (1)=14,726.1; p<0.0001
Sweden	62 020	37.5	13 655 878	52.4
Period
1989–2002	41 453	25.1	7 019 068	27.0	χ² (1)=300.0; p<0.0001
2003–2016	123 959	74.9	19 019 934	73.0
Age group
18–34	25 767	15.6	5 597 252	21.5	χ² (2)=11,476.2; p<0.0001
35–64	122 724	74.2	19 132 263	73.5
65+	16 921	10.2	1 309 486	5.0
Marital status
Married	133 346	80.6	22 410 144	86.1	χ² (1)=4,060.5; p<0.0001
Divorced/widowed	32 065	19.4	3 628 857	13.9
Total	165 411	100.0	26 039 002	100.0
Females
Country
Denmark	89 256	57.6	12 568 003	48.0	χ² (1)=5,713.8; p<0.0001
Sweden	65 759	42.4	13 637 881	52.0
Period
1989–2002	23 824	15.4	7 021 278	26.8	χ² (1)=10,270.3; p<0.0001
2003–2016	131 192	84.6	19 184 606	73.2
Age group
18–34	38 411	24.8	7 764 473	29.6	χ² (2)=2,010.0; p<0.0001
35–64	109 980	70.9	17 576 051	67.1
65+	6625	4.3	865 361	3.3
Marital status
Married	123 922	79.9	22 114 877	84.4	χ² (1)=2,310.5; p<0.0001
Divorced/widowed	31 094	20.1	4 091 007	15.6
Total	155 016	100.0	26 205 884	100.0	χ² (1)=404.5; p<0.0001

*Person-years were calcalculated based on person-months and rounded to nearest integer. **χ² tests assessing differences between SSM and OSM.
OSM, opposite-sex marriage; SSM, same-sex marriage.