Table 3.

Contraction patterns

	OP pH-	OP pH+	P value
No. of correct swallows	184	240
No. of peristaltic contractions (without breaks)	154/182 (84.61%)	144/235 (61.27%)	< 0.01
No. of failed contractions	2/184 (1.08%)	5/240 (2.08%)
No. of peristaltic contractions with small breaks	21/182 (11.95%)	68/235 (28.93%)	< 0.01
No. of peristaltic contractions with large breaks	7/182 (3.84%)	23/235 (9.78%)	< 0.01
No. of premature contractions	0	0
No. of rapid contractions	0	0

Normal (OP pH-) or pathological (OP pH+). OP: Oropharyngeal.