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Table 1 Characteristics of cases and controls by factors matched (or surrogate factors) in the original study

From: The association between high birth weight and the risks of childhood CNS tumors and leukemia: an analysis of a US case-control study in an epidemiological database

Variables

Controls

Cases

CNS tumor

Leukemia

(N = 822)

(N = 72)

(N = 124)

Year of birth

1946–1989

1952–1989

1949–1989

 1946–1959

120 (14.6%)

11 (15.3%)

22 (17.7%)

 1960–1969

240 (29.2%)

16 (22.2%)

44 (35.5%)

 1970–1979

294 (35.8%)

28 (38.9%)

35 (28.2%)

 1980–1989

168 (20.4%)

17 (23.6%)

23 (18.6%)

Age at diagnosis (years)a

 Mean (SD)

6.1 (4.4)

5.6 (4.3)

5.3 (4.1)

 Min-Max

0–15

0–14

0–14

Sex

 Male

493 (60.0%)

45 (62.5%)

71 (57.3%)

 Female

329 (40.0%)

27 (37.5%)

53 (42.7%)

Ethnicity

 Black

18 (2.2%)

3 (4.2%)

2 (1.6%)

 White

804 (97.8%)

69 (95.8%)

122 (98.4%)

Maternal age (years)

 Mean (SD)

25.5 (5.4)

25.2 (5.2)

25.5 (5.8)

 Min-Max

14–44

15–37

16–42

DOE sitesb

 Hanford

271 (32.9%)

19 (26.4%)

28 (22.6%)

 INEL

183 (22.3%)

15 (20.8%)

33 (26.6%)

 Oak Ridge

363 (44.2%)

37 (51.4%)

61 (49.2%)

 Unknown

5 (0.6%)

1 (1.4%)

2 (1.6%)

Gestational age (weeks)c

 Mean (SD)

39.3 (1.9)

38.5 (2.4)

39.4 (1.8)

 Min-Max

28–45

27–43

34–44

  1. SD standard deviation, DOE Department of Energy
  2. a Age at diagnosis for controls was calculated, using the year of diagnosis assigned by the original study, which was matched case-control study
  3. b DOE sites: a surrogate variable for county of residence
  4. c Not matched in the original study
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BMC Cancer

ISSN: 1471-2407

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