Table 1 Characteristics of the study population, Nordic countries, 1967–2013

	Cases		Controls
Variable	n	%	n	%
Year of birth
<1940	4292	19	42 860	19
1940–1949	9277	42	92 566	42
1950–1959	6059	27	60 243	27
1960–1969	2097	9	20 478	9
⩾1970	460	2	4099	2
Age at diagnosis/matching (years)
<40	1549	7	14 000	6
40–49	4250	19	42 490	19
50–59	7621	34	76 125	35
60–69	6533	29	65 372	30
⩾70	2232	10	22 259	10
Parity
1	2764	12	26 121	12
2	8646	39	85 954	39
3	6273	28	63 259	29
⩾4	4502	20	44 912	20
Age at first birth (years)
<20	870	4	8701	4
20–29	7871	35	77 992	35
30–39	2823	13	26 395	12
⩾40	179	1	1792	1
Missing	10 442	47	105 366	48
Age at last birth (years)
<20	129	1	1332	1
20–29	7992	36	78 976	36
30–39	12 481	56	124 256	56
⩾40	1583	7	15 682	7
Time since first birth (years)
<10	951	4	8071	4
10–19	2315	10	22 084	10
20–29	3789	17	37 898	17
⩾30	4688	21	46 827	21
Missing	10 442	47	105 366	48
Time since last birth (years)
<10	2447	11	22 158	10
10–19	4683	21	47 722	22
20–29	7275	33	73 216	33
⩾30	7780	35	77 150	35
Total	22 185	100	220 246	100

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