Figure 1.

Testing processes using different test combination models a) Example of simultaneous testing (a): Two screening tests administered simultaneously. Further assessment required if either test failed. b) Example of simultaneous testing (b): Two screening tests administered simultaneously. Further assessment required only if both tests failed c) Example of sequential testing: First screening test is performed. Proceed to second screening test only if first test failed. Then proceed to further assessment only if second test is also failed. (MOTYB=months of the year backwards test; SSF5=spatial span forwards test with a cutoff of 5).