A Note About Rounding Of Results - Interacoustics OtoRead Operation Manual

4. The averaging time used for this test.
5. The mode selected for this test.
6. The f2 frequency.
7. The pressure levels of f1 and f2 respectively.
8. The level of the emission in dB SPL.
9. The noise floor in dB SPL.
10. The signal-to-noise ratio (DP level minus the noise floor).
11. A "P" indicates that the signal-to-noise ratio for the test
was equal to or above the SNR criterion.
12. The thick bars indicate the noise floor in dB SPL.
13. The small bars indicate the emission level in dB SPL.

A Note about Rounding of Results

The user needs to be aware that the SNR and single PASS criterion
are calculated from the full internal precision of the instrument, and
not from the values shown in the printout for the emission (TE) and
noise floor (NF) estimates. This approach is used to preserve the full
precision of the test results, but can result in some apparent errors in
the printout due to the effects of rounding. In the printout example
above, assume the actual values at 1.5 kHz were TE = 4.5 dB, NF =
-0.4 dB, which results in SN = 4.9 dB.
The printout values are rounded up to the nearest integer and are
shown as TE = 5, NF = 0, and SN = 5. This can result in what
appears to be an error with regard to the pass criterion. If the pass
criterion is 5 dB while the actual SN = 4.9, the printed value will be 5
but a "P" will NOT be printed (as shown for #11 above). Again, the
pass/refer criterion is based on the full precision of the results, and
not the rounded values that are printed. The full precision value for
the SN must be equal to or greater than the pass criterion (5 dB in
this example) for the "P" to be printed. A similar apparent problem
can occur in which the printed SN value appears to be incorrect. If
the actual values were TE = 4.5 dB, NF = 0.4 dB, resulting in SN =
4.1 dB, the printed values would be TE = 5 dB, NF = 0, SN = 4. The
printed SN value of 4 dB appears to be an error, but is in fact correct.
OtoRead Screener Interpreting Test Results Page 37