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Table 1 Cut-off values for BED and AI incidence assays for predetermined incidence assay window periods

From: Can HIV incidence testing be used for evaluating HIV intervention programs? A reanalysis of the Orange Farm male circumcision trial (ANRS-1265)

Window period

3 m

(91.5 d)

6 m

(183 d)

9 m

(274 d)

12 m

(366 d)

15 m

(457 d)

18 m

(549 d)

BED Cut-off

0.325

0.733

0.90

1.51

1.89

2.27

95% CI

0.21 to 0.41

0.49 to 1.14

0.66 to 1.50

0.88 to 1.89

1.58 to 2.17

2.02 to 2.64

AI Cut-off

31.6

80.5

90.0

94.0

96.0

NC

95% CI

20.6 to 37.0

42.9 to 90.1

84.0 to 94.0

90.0 to 97.5

94.0 to 99.7

 
  1. m: months
  2. d: days
  3. AI: avidity index
  4. NC: Not calculable
  5. CI: Confidence interval