Table 3.

Impedance patterns and probability of association with symptoms

Pattern	Number of patients with this pattern	Number of events	Mean number of events per patient	Probability of association with symptom (95% confidence interval)
Gastric belch (without liquid reflux)	72	738	10.3	7.5% (4.7–11.5)
Gastric belch with distal liquid reflux	70	583	8.3	7.7% (5.0–11.5)
Gastric belch with proximal liquid reflux	33	77	2.3	10.9% (5.4–20.9)
Supragastric belch (without liquid reflux)	45	312	6.9	10.6% (6.4–16.9)
Supragastric belch with distal liquid reflux	53	278	5.3	11.5% (6.8–18.6)
Supragastric belch with proximal liquid reflux	23	194	8.4	17.1% (10.8–25.9)*
Swallow-induced distal liquid reflux	58	212	3.7	8.8% (5.6–13.5)
Swallow-induced proximal reflux	21	38	1.8	20.3% (10.4–35.8) ‡
Distal liquid reflux (not swallow induced)	77	1330	17.3	8.2% (5.6–11.7)
Proximal liquid reflux (not swallow induced)	61	534	8.8	11.0% (7.3–11.1)

^*p<0.05 vs gastric belch, gastric belch with reflux, distal liquid reflux, swallow-induced distal reflux and supragastric belch with distal liquid reflux

^‡p<0.05 vs gastric belch, gastric belch with reflux, distal liquid reflux, swallow-induced distal reflux and proximal liquid reflux