Table 2.

Characteristics of the study participants with follicular lymphoma in the Scandinavian Lymphoma Etiology (SCALE) study (Denmark/Sweden) and in the University of California San Francisco (UCSF) study

	SCALE overall N (%)	Swedish FL cases N (%)	Danish FL cases N (%)	UCSF FL cases N (%)
Number of participants	373	231 (62)	142 (38)	213
Sex (men)	185 (50)	111 (48)	74 (52)	110 (52)
Age (years)
18-34	9 (2)	6 (3)	2 (1)	3 (1)
35-44	30 (8)	15 (6)	13 (9)	15 (7)
45-54	105 (27)	58 (25)	43 (30)	50 (23)
55-64	139 (36)	83 (36)	53 (37)	73 (34)
65-75	100 (26)	69 (30)	31 (22)	42 (20)
76-84	-	-	-	30 (14)
Median (range)	57 (22–74)	58 (22–74)	56 (33–72)	60 (29–84)
Participant born in Sweden or Denmark (yes)	342 (92)	203 (88)	139 (98)	-
Parents born in Sweden or Denmark (yes)	331 (89)	193 (84)	138 (97)	-
Participants of European ancestry B	-	-	-	213 (100)
Ann Arbor stage
I	77 (22)	50 (23)	27 (19)	-
II	48 (13)	32 (15)	16 (12)	-
III	100 (28)	69 (32)	31 (22)	-
IV	133 (37)	68 (31)	65 (47)	-
Missing	15	13	2	-
FLIPI A
Low risk	136 (36)	107 (46)	29 (20)	-
Intermediate risk	152 (41)	68 (29)	84 (59)	-
High risk	85 (23)	56 (24)	29 (20)	-
Progression (yes)	-	155 (67)	-	-
Missing	-	2 (1)	-	-
Transformation (yes)	-	56 (26)	-	-
Missing	-	12 (5)	-	-
Rituximab first line/any treatment line (yes)	-	24 (10)/106 (47)	-	-
Missing	-	5 (2)	-	-
Died	137 (37)	88 (38)	49 (35)	56 (26)
Died due to lymphoma	88 (24)	54 (23)	34 (24)	24 (11)

^AThe Swedish patients were classified according to the number of FLIPI risk factors. The Danish patients were classified according to a modified FLIPI, based on age and stage only.

^BNon-European samples according to MDS plot inspection were removed in UCSF.