| 1 | (Caffedrine or caffeine or Coffeinum or coffee or caffein*).ab,ti | 46,031 |
| 2 | Coffee/ | 8042 |
| 3 | Caffeine/ | 24,875 |
| 4 | 1 or 2 or 3 | 51,853 |
| 5 | Marathon Running/ or Running/ | 22,700 |
| 6 | (run or runner or running or marathon).ab,ti. | 163,459 |
| 7 | (endurance or aerobic).ab,ti. | 127,679 |
| 8 | 5 or 6 or 7 | 287,903 |
| 9 | 4 and 8 | 1061 |
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