Table 3. Parameters of the ingressive and egressive phases of the purr vocalization.

Parameters	Ingressive phase		Egressive phase
Mean relative sound pressure level (dB)	70.66–72.4	-	71.72–76.43	-
Mean duration of the phases (ms)	251–819	573 ± 72	484–756	576 ± 90
Max duration (ms) (sd)	-	740	-	700
Min duration (ms) (sd)	-	450	-	360
Mean No. of cycles per phase	13.41–21.28	13.19 ± 1.64	12.46–20.15	12.43 ± 1.21
Max No. of cycles per phase	-	15	-	15
Min No. of cycles per phase	-	10	-	10
MeanF0 (Hz)	23.00–26.09	23.24 ± 3.58	20.94–27.21	21.98 ± 3.36
MaxF0 (Hz)	-	28.8	-	30.5
MinF0 (Hz)	-	18.2	-	17.1
No. of cats	4	1	4	1
Reference	[27]	[16]	[27]	[16]

Data are shown as mean ± standard deviation or median (interquartile range).