Table 1

Baseline demographic characteristics of cases and controls

Characteristic

Cases

Controls


N

%

N

%


Gender

Male

13

50.0

33

53.2

Female

13

50.0

29

46.8

Racea

White

17

65.4

43

69.3

Black

3

11.5

4

6.5

Native American

0

0.0

1

1.6

Asian/Pacific Islander

1

3.9

6

9.7

Other

4

15.4

8

12.9

Ethnicitya

Hispanic

7

26.9

14

22.6

Non-Hispanic

18

69.2

48

77.4

County of residenceb

Alameda

2

7.7

9

14.5

Contra Costa

1

3.9

6

9.7

Marin

1

3.9

2

3.3

San Francisco

10

38.5

17

27.4

San Mateo

5

19.2

7

11.3

Santa Clara

6

23.1

18

28.0

Solano

1

3.9

1

1.6

Sonoma

0

0

2

3.2

Age group

1–5 years

5

19.2

10

16.1

6–11 years

0

0.0

0

0.0

12–17 years

3

11.5

8

12.9

18–25 years

3

11.5

8

12.9

26–44 years

12

46.2

29

46.8

45–64 years

2

7.7

5

8.1

65+ years

1

3.9

2

3.2

Chronic medical condition

Yes

9

34.6

16

24.2

No

15

61.5

46

74.2

Missing

1

3.9

1

1.6

TOTAL

26c

62


aOne case refused to provide information on race or ethnicity. bDistribution of this variable cannot be meaningfully evaluated because of matching across counties. cNo matched controls were recruited for one case; only 25 were analyzed further

Khalakdina et al. BMC Public Health 2003 3:11   doi:10.1186/1471-2458-3-11

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