Table 5.

Change scores for adults of (1) whole syllables versus 50% cough and (2) 50% cough versus three pitch periods, and results for t-tests comparing those scores. Standard deviations are in parentheses. Degrees of freedom are 19.

Change score	(1)	(2)	t	p
	Whole – 50%	50% – 3 pp
	Mean difference (SD)	Mean difference (SD)
UP
/b/, high–low	0.0 (0.0)	0.1 (0.4)	–	NS
/b/, front–back	−0.1 (0.4)	0.0 (0.0)	–	NS
/d/, high–low	0.0 (0.0)	3.9 (7.8)	−2.21	0.040
/d/, front–back	0.0 (0.0)	11.6 (10.6)	−4.86	<0.001
SWS
/b/, high–low	0.6 (2.2)	5.1 (7.9)	−2.58	0.019
/b/, front–back	2.8 (7.5)	9.8 (8.9)	−3.17	0.005
/d/, high–low	−1.4 (4.4)	29.1 (15.9)	−7.86	<0.001
/d/, front–back	−0.8 (5.4)	35.5 (12.9)	−11.09	<0.001
VOC
/b/, high–low	11.0 (16.6)	3.8 (10.1)	1.33	NS
/b/, front–back	12.3 (14.6)	14.0 (15.2)	−0.30	NS
/d/, high–low	13.1 (11.7)	21.2 (16.6)	−1.36	NS
/d/, front–back	0.8 (18.2)	20.8 (14.3)	−3.52	0.002