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Table 4 Common countries of first-author affiliations for 3,107 English-language articles in the Malaria in Pregnancy Library, January 2012

From: The Malaria in Pregnancy Library: a bibliometric review

  Country Number Articles in activejournals (%) Articles indexedin PubMed (%) Articles in journals withimpact factor (%) Median impactfactor (range) Articles injournals with AIS (%) MedianAIS (range)
1 USA 669 639 (95.5) 627 (93.7) 571 (85.4) 3.55 (0.28-53.49) 565 (84.5) 1.23 (0.06-21.35)
2 UK 384 339 (88.3) 333 (86.7) 293 (76.3) 3.49 (0.44-36.10) 289 (75.3) 1.07 (0.17-19.31)
3 Nigeria* 269 246 (91.4) 174 (64.7) 111 (41.3) 1.25 (0.16-36.10) 81 (30.1) 0.53 (0.01-19.31)
4 Thailand 124 115 (92.7) 118 (95.2) 104 (83.9) 3.03 (0.44-53.49) 103 (83.1) 0.91 (0.17-21.35)
5 India 123 116 (94.3) 96 (78.0) 60 (48.8) 1.59 (0.30-33.63) 47 (38.2) 0.58 (0.16-12.72)
6 France 120 118 (98.3) 119 (99.2) 115 (95.8) 3.49 (0.97-33.63) 115 (95.8) 0.99 (0.35-12.72)
7 Australia 113 107 (94.7) 103 (91.2) 100 (88.5) 4.10 (0.59-35.20) 94 (83.2) 1.33 (0.34-16.12)
8 Tanzania 82 71 (86.6) 71 (86.6) 43 (52.4) 2.79 (0.30-33.63) 42 (51.2) 0.91 (0.35-12.72)
9 Kenya 68 64 (94.1) 60 (88.2) 49 (72.1) 2.84 (1.08-33.63) 48 (70.6) 0.99 (0.35-16.82)
9 Denmark 68 65 (95.6) 66 (97.1) 66 (97.1) 4.10 (1.60-33.63) 64 (94.1) 1.33 (0.48-12.72)
  1. Abbreviations: AIS Article Influence Score.
  2. *Nigeria: comparing percentage of articles indexed in PubMed to any other country in the list: Chi-square test p < 0.05; comparing the presence of an impact factor and article influence score of a journal to any other country in the list: Chi-square test p < 0.05 except for India and Tanzania for the presence of an impact factor, and India for the presence of an article influence score; comparing the median impact factor and median article influence score for Nigeria to any other country in the list: (non-parametric test) p < 0.05 except for India for the median article influence score.
  3. †India: comparing percentage of articles indexed in PubMed to any other country in the list: Chi-square test p < 0.05 except for Tanzania and Kenya; comparing the presence of an impact factor and an article influence score to any other country in the list: Chi-square test: p < 0.05 except for Nigeria and Tanzania; comparing the median impact factor and the median article influence score for India to any other country in the list: (non-parametric test) p < 0.05 except for Nigeria for the median article influence score.