The incidences of gastrointestinal AEs for albiglutide and sitagliptin were as follows : overall , 31.7 % , 25.2 % ; diarrhea , 10.0 % , 6.5 % ; nausea , 4.8 % , 3.3 % ; and vomiting , 1.6 % , 1.2 % , respectively .