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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Invest Ophthalmol Vis Sci. 2008 Aug 21;50(1):107–113. doi: 10.1167/iovs.08-2367

Table 6.

Results of Tests of Mediation

GDS Prefer
Not to Drive		 Visual Motor
Integration		 Psychomotor
Speed and
Visual Scanning
Visual motor integration, VMI 0.01 (9.63) 0.6 — —
Psychomotor speed and visual scanning 0.009 (6.9) 0.5 — —
CS 0.03 (8.8) 0.038 (10.8) 0.001 (16.6) 0.001 (25.5)

The tests examined whether GDS, preference not to drive, and three measures of cognitive status are mediators for the impact of functional status on the decision to stop or restrict driving. Data are presented as the P (Sobel Test) and the amount of mediation (%).