Table 2

Correlations between 24 hour and postprandial acid exposure and number of reflux episodes/hour on the one hand and total, proximal, and distal stomach emptying, oesophageal contractile activity and clearance, grade of oesophagitis, age, and BMI on the other

	24 hour acid exposure		Postprandial acid exposure		Reflux episodes/h
Variable	r (69)	p	r (69)	p	r (69)	p
Gastric emptying
AUC_tot	0.080	0.505	0.058	0.624	0.086	0.478
AUC_prox	0.256	0.031	0.229	0.055	0.251	0.035
AUC_dist	−0.197	0.099	−0.183	0.126	−0.190	0.113
Oesophageal contractile activity
LOS resting pressure	−0.466	0.0001	−0.417	0.0003	−0.509	0.0001
Amplitude distal	−0.329	0.005	−0.303	0.010	−0.408	0.0004
Amplitude middle	−0.337	0.004	−0.322	0.006	−0.432	0.0002
Amplitude proximal	0.031	0.795	−0.054	0.657	−0.083	0.493
% Failed contractions	0.155	0.196	0.253	0.034	0.290	0.014
Oesophageal clearance time	0.121	0.313	0.028	0.815	0.211	0.077
Gastro-oesophageal reflux
24 hour acid exposure	—	—	0.808	0.0001	0.845	0.0001
Postprandial acid exposure	0.808	0.0001	—	—	0.697	0.0001
Oesophagitis	0.489	0.0001	0.451	0.0002	0.474	0.0001
Age	0.053	0.881	0.066	0.588	0.050	0.685
Body mass index	0.122	0.310	0.102	0.395	0.179	0.136

r (69), coefficient of correlation with 69 degrees of freedom; p, error probability.