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Fluid and constipation
| Ref. | Location | Sample size | Age range (yr) | Definition of constipation | Fluid intake per day | Prevalence (%) | Odds ratio (95%CI) | P value |
| Rey et al[55], 2014 | Spain | 1500 | > 18 | Rome III | 7 glasses or less; 8-9 glasses; 10-11 glasses; 12-14 glasses; 15 glasses or more | 21; 20; 19; 18; 16 | NR | < 0.01 |
| Chang et al[46], 2007 | United States | 523 | 30-64 | Rome III | No coffee; Coffee | 18.7; 17.8 | 1.00; 0.94 (0.5, 1.77) | NS |
NR: Not reported; NS: Not significant.
