Table 1

Population and study characteristics of included studies within the meta-analysis*

Study uthor	Control group	Methodology	Country	Type of cancer	Age at diagnosis	Time period of diagnosis	Age at survey
Dongen-Melman et al40	Matched	Survey	Netherlands	Leukaemia	4.92	1983	10.2
Maule et al26	Matched	Linkage	Italy	Mixed	6.81	1971–2000	N/A
Lorenzi et al25	Matched	Survey/linkage	Canada	Mixed	4.6	1975–1995	N/A
Ahomaki et al17	Matched	Linkage	Finland	Mixed	8.8	1960–2009	27
Stam et al15	Matched	Survey	Netherlands	Mixed	7.3	1971–1984	24
Langeveld et al20	Matched	Survey	Netherlands	Mixed	8	1972–1995	24
Barerra et al41	Matched	Survey	Canada	Mixed	4	1981–1990	11
Gerdhart et al42	Matched	Survey	USA	Mixed	11.5	–	18
Kuehni et al28	Population	Survey	Switzerland	Mixed	8.1	1976–2003	27
Freycon et al43	Population	Survey/linkage	France	Leukaemia	8.3	1988–2011	23
Lancashire et al19	Population	Survey	UK	Mixed	6.5	1940–1991	22
Dumas et al21	Population	Survey	France	Mixed	6	1948–2000	36
Ghaderi et al44	Population	Survey/linkage	Norway	Mixed	10	1965–1985	N/A
Boman et al45	Population	Survey/linkage	Sweden	Mixed	–	1963–1976	31.6
Essig et al46	Sibling	Survey	USA/Canada	Leukaemia	3.5	1970–1986	27.8
Taylor et al47	Sibling	Survey	USA	Leukaemia	–	–	–
Allen et al10	Sibling	Survey	UK	Mixed	9	1975–1980	20.5
Moe et al13	Sibling	Survey	Norway	Leukaemia	5.3	1975–1980	–
Ishida et al12	Sibling	Survey	Japan	Mixed	8.4	–	21
Ness et al48	Sibling	Survey	USA	Mixed with HSCT1	9.7	1974–1998	26
Hudson et al24	Sibling	Survey	USA	Mixed	10	1970–1986	26.8
Kingma et al49	Sibling	Survey	Netherlands	Leukaemia	3	1988–1992	14
Kingma et al18	Sibling	Survey	Netherlands	Leukaemia	4	1979–1984	20
Molgard-Hansen et al50	Sibling	Survey	Nordic Countries	Leukaemia	5.5	1984–2003	16.2
Haupt et al11	Sibling	Survey	USA/Canada	Leukaemia	10.2	1970–1987	–
Kelaghan et al33	Sibling	Survey	USA	Mixed	13.25	1945–1974	30.9

Please note, where data unavailable, it has been annotated with (–).
*Haematopoeitc stem cell transplant.