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. 2013 Sep 18;7:584. doi: 10.3389/fnhum.2013.00584

Figure 4.

Figure 4

Expected response frequencies and person parameters (weighted likelihood estimation, WLE) for self-reported “mental-health symptoms due to vision problems” assessed with the respective NEI-VFQ subscale (sum score of five items). Person parameters (dotted line) lay between −4.00 and 4.49.