Table 1 Characteristics of the cohort

From: Risk of hematological malignancies from CT radiation exposure in children, adolescents and young adults

 

Hematological malignancies—numbers (%)

Entire cohort—n (%)

PYs of follow-up—n (%)

All cases

Lymphoid

All myeloid malignancies and AL

Histio. and dendritic cell

Unsp.

All*

HL

NHL

Overall

790 (100)

578 (73.2)

190 (24.1)

387 (49.0)

203 (25.7)

6 (0.8)

3 (0.4)

876,771 (100)

6,863,833 (100)

Sex

         

 Male

466 (59.0)

343 (59.3)

117 (61.6)

226 (58.4)

118 (58.1)

3 (50.0)

2 (66.7)

491,426 (56.0)

3,826,559 (55.7)

 Female

324 (41.0)

235 (29.7)

73 (38.4)

161 (41.6)

85 (41.9)

3 (50.0)

1 (33.3)

385,345 (44)

3,037,274 (44.3)

Age at first CT (years)

 <1

93 (11.8)

70 (12.1)

12 (6.3)

58 (15)

22 (10.8)

0 (0)

1 (33.3)

100,628 (11.5)

789,500 (11.5)

 1 to <5

126 (15.9)

95 (16.4)

13 (6.8)

82 (21.2)

30 (14.8)

1 (16.7)

0 (0)

149,483 (17.0)

1,159,795 (16.9)

 5 to <10

132 (16.7)

98 (17.0)

31 (16.3)

67 (17.3)

33 (16.3)

1 (16.7)

0 (0)

168,135 (19.2)

1,308,483 (19.1)

 10 to <15

169 (21.4)

123 (21.3)

58 (30.5)

65 (16.8)

42 (20.7)

3 (50.0)

1 (33.3)

190,561 (21.7)

1,525,680 (22.2)

 ≥15

270 (34.2)

192 (33.2)

76 (40.0)

115 (29.7)

76 (37.4)

1 (16.7)

1 (33.3)

267,964 (30.6)

2,080,375 (30.3)

Years since first CT examination at end of follow-up

 2 to <5

266 (33.7)

197 (34.1)

55 (28.9)

142 (36.7)

64 (31.5)

4 (66.7)

1 (33.3)

215,041 (24.5)

323,031 (4.7)

 5 to <10

263 (33.3)

196 (33.9)

71 (37.4)

124 (32.0)

67 (33.0)

0 (0)

0 (0)

305,667 (34.9)

1,624,031 (23.7)

 10 to <15

137 (17.3)

99 (17.1)

42 (22.1)

57 (14.7)

35 (17.2)

2 (33.3)

1 (33.3)

188,762 (21.5)

1,938,588 (28.2)

 ≥15

124 (15.7)

86 (14.9)

22 (11.6)

64 (16.5)

37 (18.2)

0 (0)

1 (33.3)

167,301 (19.1)

2,978,183 (43.4)

Birth cohort

 <1980

162 (20.5)

115 (19.9)

42 (22.1)

73 (18.9)

45 (22.2)

2 (33.3)

0 (0)

65,725 (7.5)

1,169,822 (17.0)

 1980 to <1985

143 (18.1)

94 (16.3)

41 (21.6)

53 (13.7)

47 (23.2)

0 (0)

2 (66.7)

84,747 (9.7)

1,101,016 (16.0)

 1985 to <1990

144 (18.2)

108 (18.7)

42 (22.1)

65 (16.8)

35 (17.2)

1 (16.7)

0 (0)

152,209 (17.4)

1,434,265 (20.9)

 1990 to <1995

148 (18.7)

113 (19.6)

42 (22.1)

71 (18.3)

34 (16.7)

1 (16.7)

0 (0)

189,513 (21.6)

1,303,426 (19.0)

 1995 to <2000

107 (13.5)

81 (14)

17 (8.9)

64 (16.5)

24 (11.8)

1 (16.7)

1 (33.3)

163,306 (18.6)

989,004 (14.4)

 2000 to <2005

67 (8.5)

55 (9.5)

6 (3.2)

49 (12.7)

11 (5.4)

1 (16.7)

0 (0)

131,115 (15.0)

643,601 (9.4)

 ≥2005

19 (2.4)

12 (2.1)

0 (0)

12 (3.1)

7 (3.4)

0 (0)

0 (0)

90,156 (10.3)

222,700 (3.2)

Attained age, years

 2 to <20

404 (51.1)

299 (51.7)

75 (39.5)

224 (57.9)

99 (48.8)

5 (83.3)

1 (33.3)

435,894 (49.7)

2,132,791 (31.1)

 20 to <30

295 (37.3)

214 (37)

97 (51.1)

116 (30.0)

78 (38.4)

1 (16.7)

2 (66.7)

320,706 (36.6)

2,752,949 (40.1)

 30 to <40

86 (10.9)

62 (10.7)

18 (9.5)

44 (11.4)

24 (11.8)

0 (0)

0 (0)

104,767 (11.9)

1,633,680 (23.8)

 ≥40

5 (0.6)

3 (0.5)

0 (0)

3 (0.8)

2 (1.0)

0 (0)

0 (0)

15,404 (1.8)

344,414 (5.0)

Country

         

 Belgium

5 (0.6)

3 (0.5)

0 (0)

3 (0.8)

2 (1.0)

0 (0)

0 (0)

9,052 (1.0)

28,131 (0.4)

 Denmark

8 (1.0)

7 (1.2)

2 (1.1)

5 (1.3)

0 (0)

1 (16.7)

0 (0)

15,835 (1.8)

68,053 (1.0)

 France

47 (5.9)

43 (7.4)

8 (4.2)

35 (9)

4 (2.0)

0 (0)

0 (0)

104,542 (11.9)

453,713 (6.6)

 Germany

23 (2.9)

19 (3.3)

2 (1.1)

17 (4.4)

4 (2.0)

0 (0)

0 (0)

39,501 (4.5)

162,615 (2.4)

 The Netherlands

137 (17.3)

98 (17)

30 (15.8)

68 (17.6)

37 (18.2)

2 (33.3)

0 (0)

141,294 (16.1)

1,201,627 (17.5)

 Norway

48 (6.1)

36 (6.2)

13 (6.8)

23 (5.9)

11 (5.4)

1 (16.7)

0 (0)

70,942 (8.1)

461,963 (6.7)

 Spain

21 (2.7)

17 (2.9)

8 (4.2)

9 (2.3)

4 (2.0)

0 (0)

0 (0)

67,031 (7.6)

253,968 (3.7)

 Sweden

107 (13.5)

79 (13.7)

27 (14.2)

51 (13.2)

27 (13.3)

1 (16.7)

0 (0)

119,056 (13.6)

1,151,088 (16.8)

 United Kingdom

394 (49.9)

276 (47.8)

100 (52.6)

176 (45.5)

114 (56.2)

1 (16.7)

3 (100)

309,518 (35.3)

3,082,675 (44.9)

Mean bone marrow dose (min–max), mGy

 

20 (0–286)

20 (0–286)

17 (0–209)

22 (0–286)

19 (0–117)

10 (6–22)

19 (13–25)

15.6 (0–1,684)

 
  1. Values are shown as number of participants, PYs and mGy. Histio, histiocytic cell malignancies; Unsp, unspecified; min, minimum; max, maximum. *One case could not be classified as HL or NHL.