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Age and sex distribution among cases with reflux symptoms and control subjects without reflux symptoms
| Men (%) | Women (%) | Total (%) | |
| Number of subjects | |||
| Cases | 1555 (7.6) | 1598 (6.9) | 3153 (7.3) |
| Controls | 18814 (92.4) | 21396 (93.1) | 40210 (9.7) |
| Mean age (years) | |||
| Cases | 50 | 53 | 52 |
| Controls | 48 | 47 | 48 |
| Age range (years) | |||
| Cases | 19–101 | 20–92 | 19–101 |
| Controls | 19–99 | 19–95 | 19–99 |
