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41 Prevalence of functional defecation disorders 1 TABLE 2. (continued) Europe Bouzios, 2016 43 Greece School sample (33 schools) 1658 (48.2) 6-17 Child/parental questionnaire QPGS-RIII in Greek † 8 (0.5) n/a North America Lewis, 2016 46 United States Online panel 949 (47.7) 4-18 Parental questionnaire QPGS-RIII † 17 (1.8) 0.6:1 n/a = not applicable, QPGS-RIII = Questionnaire on Pediatric Gastrointestinal Symptoms-Rome III version † validated questionnaire