Table 3

Interpretation of PPVs and LRs+ of APOE alleles and genotypes

allele/genotype
PPV [ (AD|ε)]
LR+
LR range1
Significance for diagnosis




> 10
greatly increasing risk for AD



5~ 10
moderately increasing risk for AD
ε4/ε4
39.90%
3.76
2~ 5
small increase in risk for AD
ε4
31.50%
2.60


ε3/ε4
28.80%
2.29





1~ 2
minimally increasing risk for AD

15.00% (population prevalence)

1
no change in risk for AD
ε3
12.00%
0.77
0.5~ 1
minimally decreasing risk for AD
ε2/ε4
10.82%
0.69


ε3/ε3
9.40%
0.59


ε2
6.50%
0.39
0.2~ 0.5
small decrease in risk for AD
ε2/ε3
5.70%
0.34





0.1~ 0.2
moderately decreasing risk for AD



< 0.1
greatly decreasing risk for AD

PPV, estimated positive predictive value; LR+, positive likelihood ratios.

1Reference to [39].

Zuo et al. Behavioral and Brain Functions 2006 2:13   doi:10.1186/1744-9081-2-13