Table 4. Incidence of Surgical Treatment of Achilles Tendon Rupture (per 100,000 Person-Years) by Age.
| Age (yr) | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | Annual increase | p-value | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | 8.10 | 8.37 | 8.79 | 9.29 | 10.13 | 10.22 | 10.74 | 10.57 | 10.38 | 1.039 | < 0.001* | |
| Age group | < 0.001† | |||||||||||
| 1–20 | 3.49 | 3.23 | 3.26 | 2.85 | 2.99 | 2.75 | 2.80 | 2.36 | 2.25 | 0.952 | ||
| 21–30 | 6.30 | 6.32 | 6.61 | 7.62 | 8.00 | 8.04 | 7.72 | 8.46 | 7.96 | 1.036 | ||
| 31–40 | 14.82 | 15.24 | 15.93 | 15.95 | 18.13 | 18.33 | 19.19 | 18.33 | 18.33 | 1.032 | ||
| 41–50 | 12.60 | 13.26 | 14.98 | 16.30 | 18.78 | 19.54 | 20.51 | 20.55 | 20.06 | 1.066 | ||
| 51–60 | 7.90 | 8.43 | 8.65 | 9.57 | 9.93 | 9.98 | 10.99 | 10.46 | 11.24 | 1.043 | ||
| 61–70 | 4.94 | 5.70 | 5.24 | 5.43 | 5.52 | 5.52 | 6.80 | 6.62 | 6.49 | 1.036 | ||
| ≥ 71 | 3.67 | 3.73 | 3.52 | 4.56 | 3.66 | 3.67 | 3.86 | 4.85 | 3.95 | 1.018 | ||
*The p-value of annual increasing trend in a model without an interaction effect. †The p-value of interaction effects between annual increasing trend and subgroups.