Table 1 Number of articles indexed by PubMed from top 20 countries, percentage of Africa publication, relative growth, and Poisson regression analysis of annual percent change: 1996 – 2005

South Africa

11218 (29.9)

829 (34.0)

1536 (28.4)

85.3

0.06 (0.003)

6.3

< 0.001

Egypt

6557 (17.5)

414 (17.0)

956 (17.7)

130.9

0.01 (0.004)

10.4

< 0.001

Nigeria

4795 (12.8)

38 (1.6)

834 (15.4)

2094.7

0.15 (0.005)

16.3

< 0.001

Kenya

1887 (5.0)

189 (7.7)

246 (4.6)

30.2

0.05 (0.008)

5.5

< 0.001

Tunisia

1027 (2.7)

27 (1.1)

267 (4.9)

888.9

0.27 (0.013)

31.7

< 0.001

Zimbabwe

945 (2.5)

123 (5.0)

58 (1.1)

-52.8

-0.09 (0.012)

-8.5

< 0.001

Senegal

875 (2.3)

65 (2.7)

117 (2.2)

80.0

0.04 (0.012)

3.6

0.003

Morocco

863 (2.3)

33 (1.4)

141 (2.6)

327.3

0.14 (0.013)

15.5

< 0.001

Ethiopia

860 (2.3)

79 (3.2)

116 (2.1)

46.8

0.08 (0.013)

8.1

< 0.001

Tanzania

761 (2.0)

71 (2.9)

107 (2.0)

188.4

0.06 (0.013)

6.4

<0.001

Uganda

761 (2.0)

43 (1.8)

124 (2.3)

50.7

0.11 (0.013)

11.6

<0.001

Ghana

691 (1.8)

50 (2.1)

94 (1.7)

88.0

0.06 (0.013)

5.9

<0.001

Ivory coast

516 (1.4)

24 (1.0)

55 (1.0)

129.2

0.04 (0.015)

4.7

0.003

Cameroon

512 (1.4)

24 (1.0)

83 (1.5)

245.8

0.14 (0.016)

15.2

<0.001

Malawi

450 (1.2)

34 (1.4)

57 (1.1)

67.6

0.09 (0.017)

9.2

<0.001

Sudan

442 (1.2)

34 (1.4)

68 (1.3)

100.0

0.08 (0.017)

9.9

<0.001

Guinea

428 (1.1)

65 (2.7)

33 (0.6)

-49.2

-0.03 (0.017)

-3.3

0.044

Burkina Faso

365 (1.0)

22 (0.9)

39 (0.7)

77.3

0.05 (0.018)

4.9

0.009

Eritrea

337 (0.9)

34 (1.4)

54 (1.0)

58.8

0.15 (0.020)

16.6

<0.001

The Gambia

335 (0.9)

31 (1.3)

33 (0.6)

6.5

0.01 (0.019)

0.8

0.669