Variable

Frequency (n)

Percent (%)

Age group

< 35

62

36.5

35-45

71

41.8

> 45

37

21.8

Mean age in years (± SD)

38 (± 9)

Sex

Male

153

90.0

Female

17

10.0

Residence (Region)

Dar es salaam

157

92.4

Outside Dar es salaam

13

7.6

Residence (Dar es salaam’s districts)^*

Ilala

59

37.6

Temeke

40

25.5

Ubungo

26

16.6

Kinondoni

25

15.9

Kigamboni

7

4.5

Marital status

Married

117

68.8

Divorced

2

1.2

Widow/Widower

1

0.6

Single

50

29.4

Level of education

Primary education

17

10

Secondary education

75

44.1

College/University

78

45.9

Number of donations

< 5

75

44.1

≥ 5

95

55.9

Median number of donation (IQR)

5 (3, 8)

Inter-donation time (months)

< 5

82

48.2

≥ 5

88

51.8

Median inter-donation time (IQR) (months)

5 (4, 6)