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Proportional quota sampling strategy
| Strata (age) | UK PICU population | Pro-rata | Quota sample |
| Less than 1 year | 45% | 153 | 217 |
| 1 year old | 11% | 37 | 53 |
| 2 years old | 6% | 20 | 28 |
| 3 and 4 years old | 9% | 30 | 42 |
| Total | 70% | 240 (70%) | 340 (100%) |
PICU, paediatric intensive care unit.
