| FDA | Food and Drug Administration |
| HRQoL | Health-Related Quality of Life |
| HUI | Health Utilities Index |
| HuPs | Health Related Quality of Life Utility Measure for Pre-school Children |
| IQI | Infant Health-Related Quality of Life Instrument |
| LSS | Level Sum Score |
| NICE | National Institute for Health and Care Excellence |
| PedsQL | Paediatric Quality of Life Inventory |
| QALYs | Quality Adjusted Life Years |
| TANDI | Toddler and Infant Health-Related Quality of Life Instrument |
| VAS | Visual Analogue Scale |