Table 1 Baseline characteristics of mother-HEI pair

Age (in weeks) of HIV Exposed Infant (HEI) at first dried blood spot collection (DBS): median (IQR)

8.00 (6–20)

 ≤ 6 weeks

6000

41.4

 6.1–8 weeks

2358

16.3

 8.1–20 weeks

2309

15.9

 20.1+ weeks

2979

20.6

 Missing

842

5.8

Sex of HEI

 Male

6648

45.9

 Female

6192

42.7

 Missing

1648

11.4

Breastfeeding status of HEI

 Yes

12,801

88.4

 No

617

4.2

 Missing

1070

7.4

Therapy received by pregnant HIV-infected mother

 No Rx

1010

7

 Prophylaxis

159

1.1

 cART before pregnancy

7903

54.5

 cART during index pregnancy^a

3651

25.2

 Missing

1765

12.2

DNA-PCR result of first DBS

 Negative

13,738

94.8

 Positive

750

5.2