Table 2

Distribution of sociodemographic characteristics, APOE genotype and APOE allele frequency by ethnic identity

Ethnic identity

'White'

N = 1674

'Mixed'

N = 260

'Black'

N = 395

P value X2


Age (mean/SD)

75.0 (7.0)

75.7 (7.7)

74.7 (6.9)

F = 1.7, P = 0.19


Male sex (n/%)

579 (34.6%)

95 (36.5%)

118 (29.9%)

X2 = 4.0, 2df, P = 0.14


Education level (n/%)

X2 = 25.6, 1 df, P < 0.001

None

37 (2.2%)

7 (2.7%)

14 (3.6%)

Some

344 (20.6%)

55 (21.2%)

112 (28.5%)

Primary

543 (32.5%)

87 (33.5%)

148 (37.7%)

Secondary

429 (25.7%)

62 (23.8%)

73 (18.6%)

Tertiary

317 (19.0%)

49 (18.8%)

46 (11.7%)


APOE Genotype (n/%)

X2 = 31.4, 1 df, P < 0.001

No E4 allele

1423 (85.0%)

222 (85.4%)

298 (75.4%)

Heterozygous (One e4 allele)

241 (14.4%)

32 (12.3%)

77 (19.5%)

Homozygous (Two e4 alleles)

10 (0.6%)

6 (2.3%)

20 (5.1%)


APOE allele frequency

X2 = 42.6, 4 df, P = < 0.001

E2

0.058

0.063

0.072

E3

0.864

0.852

0.780

E4

0.078

0.085

0.148


Teruel et al. BMC Medical Genetics 2011 12:43   doi:10.1186/1471-2350-12-43

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