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| Type of data | Roughly how long it stays usable | What to check |
|---|---|---|
| Material properties and stock sizes | Years | That the grade matches what you can buy |
| Anthropometric tables | Years, but population specific | Which population, and which year |
| Prices and availability | Months | The date on the listing |
| Safety standards | Revised every few years | The current version number |
| Apps and digital products | Months | Version number and dated screenshots |
| Your own observations | About one term | Whether the routine has changed |