. 2017 Oct 28;23(40):7310–7320. doi: 10.3748/wjg.v23.i40.7310

Table 3.

Comparison of gastric emptying scintigraphy results at different morphine equivalents per day in gastroparesis patients on chronic opioids using analysis of variance

Gastric emptying scintigraphy	1^st quartile (≤ 22.5 mg of morphine equivalents per day)	2^nd quartile (> 22.5 mg/d, and ≤ 60 mg/d)	3^rd quartile (> 60 mg/d, and ≤ 112.5 mg/d)	4^th quartile (> 112.5 mg/d)	P value
Retention at 2 h (mean ± SEM)	68% ± 6%	54% ± 8%	84% ± 5%	60% ± 9%	0.157
Retention at 4 h (mean ± SEM)	31% ± 7%	21% ± 8%	37% ± 10%	36% ± 19%	0.678

SEM: Standard error of mean.