Intraindividual variations in gastric emptying parameters (T1/2 and Tlag) in mice. Mice were injected with 0.9% NaCl (0.2 ml intraperitoneally) on five different experimental days (days 0, 3, 15, 25, and 35), 30 minutes before the start of the 14C octanoic breath test, and the effect on T1/2 and Tlag was determined. Values are mean (SEM) of 12 mice. No significant differences were found.