| Article | Outcome definition | Time point | Azelastine | Levocabastine | Number of participants randomised (n) and comment |
| Canonica 2003 | Itching and redness (range 0‐6) | 14 days | 1.6 | 1.4 | n = 139 Estimated from a graph (no SD) |
| Sabbah 1998 | Itching, conjunctival redness, and tearing (range 0‐9) | 13 days | 1.8 | 1.5 | n = 113 Estimated from a graph (no SD). A further composite score comprising eight symptoms was also presented |
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