| for their stimulating effects | 4 | cause |
| especially | 3 | degree |
| among athletes | 2 | other |
| caffeine → be → popular | 14 |
| caffeine → become → popular | 4 |
| negative | neutral | positive |
| 0.031 | 0.320 | 0.649 |
| Raw frequency | 18 |
| Normalized frequency | 0.298 |
| Modifier score | 0.500 |
| Perplexity | 116.037 |