TABLE 1.
Top 20 most productive countries in the research field of intranasal administration.
| Ranking | Countries | Output, n (%) | Number of papers per trillion GDP | Number of papers per million people | H-index | ACI |
|---|---|---|---|---|---|---|
| 1 | United States | 971 (33.16) | 45.31 | 2.96 | 99 | 44.88 |
| 2 | China | 470 (16.05) | 30.58 | 0.33 | 57 | 26.48 |
| 3 | India | 314 (10.72) | 109.41 | 0.23 | 50 | 28.55 |
| 4 | Germany | 231 (7.89) | 59.84 | 2.78 | 57 | 56.50 |
| 5 | Italy | 158 (5.40) | 79.00 | 2.62 | 36 | 25.75 |
| 6 | Japan | 146 (4.99) | 28.74 | 1.16 | 35 | 24.11 |
| 7 | United Kingdom | 145 (4.95) | 51.24 | 2.17 | 41 | 47.54 |
| 8 | Brazil | 92 (3.14) | 50.00 | 0.44 | 25 | 22.09 |
| 9 | Canada | 85 (2.90) | 48.85 | 2.26 | 28 | 29.27 |
| 10 | France | 82 (2.80) | 30.15 | 1.22 | 28 | 31.06 |
| 11 | Egypt | 79 (2.70) | 263.33 | 0.79 | 23 | 20.73 |
| 12 | Russia | 79 (2.70) | 46.47 | 0.55 | 13 | 15.20 |
| 13 | Sweden | 77 (2.63) | 145.28 | 7.48 | 32 | 38.29 |
| 14 | Australia | 71 (2.42) | 50.71 | 2.80 | 27 | 41.08 |
| 15 | South Korea | 70 (2.39) | 42.42 | 1.35 | 22 | 21.49 |
| 16 | Israel | 69 (2.36) | 176.92 | 7.62 | 28 | 42.93 |
| 17 | Netherlands | 67 (2.29) | 73.63 | 3.87 | 30 | 39.34 |
| 18 | Spain | 67 (2.29) | 48.20 | 1.42 | 21 | 20.01 |
| 19 | Switzerland | 62 (2.12) | 88.57 | 7.23 | 30 | 102.45 |
| 20 | Saudi Arabia | 55 (1.88) | 69.62 | 1.60 | 18 | 15.29 |
Ranking: according to the number of total papers. GDP: Gross Domestic Product. ACI: Average Citations per Item. Publications from Taiwan, Hong Kong, and Macau were assigned to China, and those from England, Northern Ireland, Scotland, and Wales were reclassified to the United Kingdom.