TABLE 1.

Mean Number of Infant Vocalizations per Minute and Percent Time Vocalizing

Vocalization values	Episodes
	FF		SF		RE
	n	percent	n	percent	n	Percent
Minimum	0	0	0	0	0	0
Maximum	12.7	19.4	31	42.9	17.6	29.2
Mean (SD)	4.4 (3.6)	4.6 (0.8)	10.2 (7.0)	14.2 (11.9)	6.0 (5.0)	8.2 (1.7)

Note. N is the number of infant vocalizations per minute and percent is the percent of time infants vocalized per minute. Minimum is the least number or lowest percent time of infant vocalizations across all infants. Maximum is the greatest number or percent time of infant vocalizations across all infants. SD is standard deviation.