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Table 1 Selected features of countries included in the study of age distribution of influenza cases. The Global Influenza B Study, 1999-2014

From: Distribution of influenza virus types by age using case-based global surveillance data from twenty-nine countries, 1999-2014

Country Latitude (a) Population (million) Ageing index (b) GDP per capita (USD) % of outpatients (c) No. influenza cases (seasons) included in the analysis:
A(H1N1) A(H1N1)pdm2009 A(H3N2) B
Southern hemisphere
 New Zealand 41.8 S 4.5 0.72 30,400 30% 2,274 (5) 3,763 (3) 4,840 (8) 2,763 (7)
 Chile 35.8 S 16.6 0.48 19,100 5% 403 (1) 5,399 (3) 3,540 (3) 897 (2)
 South Africa 29.0 S 53.0 0.22 11,500 0% - (0) 432 (3) 421 (3) 527 (3)
 Australia 25.8 S 23.4 0.84 43,000 50% 3,614 (6) 50,096 (4) 13,286 (9) 28,673 (12)
Inter-tropical belt
 Madagascar 19.4 S 21.3 0.08 1,000 100% 109 (1) 1,101 (2) 579 (4) 1,004 (4)
 Brazil (d) 10.8 S 201.0 0.32 12,100 NA - (0) - (0) - (0) 665 (4)
 Ecuador 2.0 S 15.4 0.24 10,600 0% - (0) 673 (2) 713 (3) 185 (1)
 Indonesia 1.7 S 237.4 0.25 5,200 95% 720 (2) - (0) 1,397 (4) 1,281 (4)
 Kenya 0.4 S 44.4 0.07 1,800 40% 365 (2) 1,285 (3) 1,183 (5) 1,454 (5)
 Singapore 1.2 N 5.4 0.63 62,400 100% - (0) 2,634 (3) 1,436 (3) 1,483 (3)
 Cameroon 5.7 N 22.5 0.07 2,400 90% - (0) - (0) 259 (2) 102 (1)
 Ivory Coast 7.6 N 23.2 0.09 1,800 83% - (0) 344 (2) 171 (1) 446 (2)
 Panama 8.6 N 3.7 0.28 16,500 39% - (0) 744 (1) 321 (2) 154 (1)
 Costa Rica 10.0 N 4.6 0.30 12,900 27% - (0) 4,069 (2) 1,026 (4) 387 (2)
 Nicaragua 12.9 N 6.1 0.16 4,500 43% - (0) 3,113 (3) 1,089 (4) 699 (3)
 El Salvador 13.8 N 6.1 0.25 7,500 22% - (0) 858 (2) 317 (2) 437 (3)
 Honduras 14.8 N 8.2 0.11 4,800 56% - (0) 656 (2) 277 (2) - (0)
 Guatemala 15.7 N 15.4 0.12 5,300 72% 263 (1) 1,681 (3) 169 (1) 316 (2)
 Viet Nam 16.7 N 89.7 0.23 4,000 40% 1,218 (2) 1,368 (3) 2,781 (6) 2,982 (8)
Northern hemisphere
 Bhutan 27.4 N 0.7 0.22 2,600 97% - (0) 510 (2) 130 (1) 101 (1)
 China South (e) 31.1 N 969.4 0.56 9,800 100% 5,530 (5) 40,754 (2) 30,299 (7) 35,910 (8)
 Morocco 32.0 N 33.2 0.24 5,500 70% - (0) 2,076 (2) 354 (2) - (0)
 Turkey 39.0 N 76.7 0.26 15,300 100% 1,298 (2) - (0) - (0) 289 (1)
 Portugal 39.3 N 10.4 1.17 22,900 97% - (0) 648 (3) 2,085 (8) 733 (4)
 China North (e) 39.5 N 370.9 0.56 9,800 100% 3,900 (5) 22,951 (3) 13,054 (7) 19,956 (7)
 Italy 42.9 N 59.9 1.52 29,600 60% - (0) 3,880 (2) 1,900 (2) 493 (1)
 Kazakhstan 48.0 N 17.9 0.28 14,100 5% - (0) 108 (1) 421 (3) 163 (1)
 Ukraine 49.1 N 44.6 1.14 7,400 NA - (0) 104 (1) - (0) - (0)
 England (f) 52.3 N 53.0 0.91 37,300 57% 179 (1) 2,438 (3) 1,743 (6) 1,319 (3)
       19,873 (33) 151,685 (60) 83,791 (102) 103,419 (93)
  1. NA: not available
  2. (a) Latitude of centroid (when available) or largest city
  3. (b)Defined as the number of people aged 65 years or older per hundred people aged 14 years or younger
  4. (c)Proportion of outpatients among reported influenza cases
  5. (d)Information on subtype of influenza A cases was not available for Brazil
  6. (e)Ageing index and GDP per capita of China (whole country)
  7. (f)Ageing index and GDP per capita of United Kingdom