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Underlying cross-tabulation of cycling, age, and life satisfaction in a hypothetical population
| Population | Satisfied | Not Satisfied | Total |
|---|---|---|---|
| Children who cycle | 5,000 | 5,000 | 10,000 |
| Adults who cycle | 7,500 | 2,500 | 10,000 |
| Total for cyclists | 12,500 | 7,500 | 20,000 |
| Children who don’t cycle | 2,500 | 7,500 | 10,000 |
| Adults who don’t cycle | 2,500 | 7,500 | 10,000 |
| Total for non-cyclists | 5,000 | 15,000 | 20,000 |
| Population Total | 17,500 | 22,500 | 40,000 |
Risk Difference = 12,500/20,000–5,000/20,000 = 0.375
