Analgesia use prior to surgery and at 6 months, 1 year and 2 years postsurgery
| Analgesia | Presurgery | 6 months | 12 months | 24 months | Short term* (baseline vs 6 months) | Long term* (baseline vs 24 months) | Change† (6 months vs 24 months) |
| Paracetamol | 76.0% (4118) | 59.8% (1934) | 60.6% (1235) | 61.4% (610) | 0.000↑ (1915) | 0.000↑ (604) | 0.001↓ (388) |
| NSAID | 69.8% (4099) | 48.9% (1924) | 48.3% (1229) | 52.0% (603) | 0.000↑ (1903) | 0.000↑ (593) | 0.013↓ (385) |
| Opiates | 28.1% (3953) | 16.1% (1895) | 16.8% (1214) | 16.6% (592) | 0.000↑ (1859) | 0.000↑ (575) | 0.006↓ (376) |
Note that there is some variation in total number of responses depending on whether patients chose not to answer some questions.
*Statistical comparisons of short-term change in analgesia use (6 months postsurgery) and long-term change in analgesia use (2 years postsurgery) with baseline analgesia use (presurgery) assessed using a two-tailed sign test.
†Statistical comparison of change in analgesia use over time post-treatment (between 6 months and 2 years) using a two-tailed sign-test.
↑, statistically significant increase; ↓, statistically significant decrease; NSAID, non-steroidal anti-inflammatory drug.