Bravo (wireless) ambulatory esophageal pH monitoring: How do day 1 and day 2 results compare?

Table 1 Bravo data analysis using mean differences for d 1-d 2 and medians with 95% confidence intervals

Variable	d 1(mean)	d 2(mean)	P-Value	95% CI
Total time pH < 4 (%)	10.4	7.1	0.0049	0.8-8.0
Total time pH < 4-Upright (%)	11.7	6.3	0.0051	1.6-7.9
Total time pH < 4-Supine (%)	9.4	10.0	0.8596
Mean number of reflux episodes (n)	65.3	55.6	0.0257
Mean number of long refluxes (n)	6.8	3.8	0.0077	0.0-6.0
Mean duration of long refluxes (min)	26.5	19.7	0.0617
Total heartburn episodes (n)	6.2	8.0	0.2752
Heartburn episodes with pH < 4 (n)	2.5	2.9	0.686
Symptom score	0.323	0.254	0.1353