Table 2. Mean rate of reliable waveforms considering the positive results simultaneously obtained with both protocols (PR and PP) or with either protocol (PR or PP).

	Rate of reliable waveforms (%)
	PR and PP	PR or PP
All rings	47.8 ± 16.5	76.3 ± 13.8
R1	57.1 ± 33.1	75 ± 34
R2	67.9 ± 24.9	91 ± 13.3
R3	74.4 ± 22.8	92.3 ± 12
R4	58.3 ± 20.7	87.5 ± 13.4
R5	27.9 ± 21.6	67.3 ± 20.3
R6	14.3 ± 15.4	48.9 ± 25.5

PR = pattern reversal; PP = pattern pulse.