Chapter 1: Burden of Digestive Disorders Ljotsson et al. 2020104 Palsson et al. 2020105 Sweden UK UK Belgium Belgium Egypt Egypt France France Germany Germany Netherlands Netherlands Israel Sperber et al. 202189 Israel Italy Poland Romania Russia Russia Spain Sweden Turkey Turkey UK Turkey Turkey Self-completed paper questionnaire provided at appointment Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Self-completed online questionnaire Interview-administered questionnaire Interview-administered questionnaire Rome III (approximated) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Rome IV (defined as per Rome) Rome III (defined as per Rome) Rome IV (defined as per Rome) Data source: Oka et al.90 Table shows studies conducted in UEG member countries. 1158 1994 1994 2021 2021 2020 2020 2019 2019 2020 2020 2008 2008 2012 2012 2063 2057 2049 2000 2000 2072 2084 2010 2010 2027 1950 1950 164 (14.2) 175 (8.8) 92 (4.6) 152 (7.5) 67 (3.3) 283 (14.0) 154 (7.6) 198 (9.8) 85 (4.2) 224 (11.1) 75 (3.7) 195 (9.7) 76 (3.8) 258 (12.8) 64 (3.2) 103 (5.0) 91 (4.4) 72 (3.5) 330 (16.5) 118 (5.9) 87 (4.2) 83 (4.0) 197 (9.8) 78 (3.9) 81 (4.0) 18 (0.9) 8 (0.4) White Book 2: Part 1 106