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| Elder | Younger | P* | |
|---|---|---|---|
| Ocular signs (7 signs) | 2.8 ± 1.5 | 3.6 ± 1.4 | 0.0034 |
| Laboratory investigations (4 signs) | 1.5 ± 1.2 | 2.0 ± 1.2 | 0.023 |
| All (11 signs) | 4.3 ± 2.2 | 5.5 ± 2.1 | 0.0021 |
*: analysed by the Mann–Whitney U test
