Table 1.

Characteristics of the Study Population by Diabetes Status, Reykjavik Study, 1968–2015

		Reykjavik Studya				AGES Studyb
Characteristic	Category	No T2D	T2D	% T2D	All women	Number	% T2D
Participants	Number	9,312	294	3.1	9,606	3,103	10.1
Breast cancer cases	Number	712	16	2.2	728	93	11.88
Deaths	Number	6,544	255	3.8	6,799	1,414	12.6
Person-years	Number	266,738	6,023	2.2	272,761	30,769	9.5
Follow-up time	Mean ± std	28.6±11.5	20.5±10.9	-	28.4±11.6	9.9±3.4	-
Age at cohort entry	Mean ± std	53.0±8.9	60.4±9.2	-	53.2±9.0	76.8±5.9	-
Age at breast cancer	Mean ± std	69.7±11.2	73.1±9.7	-	69.7±11.2	82.0±6.3	-
Age at diabetes	Mean ± std	NA	56.8±11.7	-	56.8±11.7	75.5±9.4	-
Height (cm)	Mean ± std	163.2±5.7	161.8±6.0		163.1±5.7	160.6±5.8	-
Birth cohort	1907–1914	1,348	97	6.7	1,445	72	12.3
	1915–1919	1,636	53	3.1	1,689	298	10.5
	1920–1924	2,055	56	2.6	2,111	642	12.2
	1925–1929	2,058	48	2.3	2,106	850	10.7
	1930–1936	2,215	40	1.8	2,254	928	7.7
Location of early life residence	Reykjavik	3,282	115	3.4	3,397	1,142	12.1
	Coastal area	3,084	95	3.0	3,179	1,009	9.6
	Rural	2,445	69	2.7	2,514	796	8.0
	Missing	501	15	2.9	516	156	9.0
Education, yrs	Primary	5,034	190	3.6	5,224	1,367	11.1
	Secondary	3,495	88	2.4	3,583	1,396	9.2
	College	783	16	2.0	799	340	10.0
BMI, kg/m2	<18.5	223	5	2.2	228	56	5.4
	≥18.5 to <25	4,992	69	1.4	5,061	1,012	5.6
	≥25 to <30	3,083	113	3.5	3,196	1,258	9.6
	≥30	1,014	107	9.6	1,121	777	17.0
Smoking status	Never	4,099	134	3.2	4,223	1,624	10.8
	Past	1,418	70	4.7	1,488	993	10.0
	Current	3,795	90	2.3	3,885	377	8.8
Regular sports	No	7,249	239	3.2	7,488	1,882	10.6
	Yes	2,063	55	2.6	2,118	775	7.5
Age at menarche, yrs	≤12	1,578	61	3.7	1,639	572	11.5
	13	2,417	82	3.3	2,499	753	8.9
	14	2,710	49	1.8	2,759	972	9.4
	≥15	1,848	51	2.7	1,899	640	8.6
	Missing	759	51	6.3	810	166	20.5
Number of children	0	937	40	4.2	977	218	8.3
	1–2	2,452	53	2.1	2,505	661	3.3
	≥3	5,874	201	3.3	6,075	2,060	11.6
	Missing	49	0	0	49	164	20.7
Age at first live birth,	<25	4,654	137	2.9	4,792	1,788	8.3
yrs	≥25	3,059	77	2.3	3,136	893	9.5
	Missing	662	40	6.5	702	204	9.5

^aT2D diagnosis based on self-report (N=140) or elevated glucose levels (N=154).

^bValues are for exams conducted among AGES participants in 2002–20006.