TABLE 1.
Comparison of Cases and Controls Before Anterior Cruciate Ligament Reconstruction (Index Year in Controls)a
| Cases | Controls | P Valueb | 95% CIc | |
|---|---|---|---|---|
| Age, y | 27.1 ± 4.05 | 27.1 ± 1.55 | .971 | –1.5 to 1.5 |
| Experience in NHL, y | 6.61 ± 4.18 | 6.61 ± 4.20 | .999 | –2.2 to 2.2 |
| Body mass index, kg/m2 | 27.1 ± 1.75 | 27.1 ± 1.19 | .924 | –0.61 to 0.68 |
| Games played per season, n | 391 ± 319 | 364 ± 276 | .696 | –113 to 168 |
| Goals per season, n | 12.9 ± 10.5 | 8.70 ± 8.70 | .068 | –0.33 to 8.8 |
| Assists per season, n | 17.7 ± 12.2 | 12.8 ± 11.3 | .081 | –0.62 to 10 |
| Points scored per season | 31.1 ± 22.0 | 21.6 ± 20.0 | .056 | –0.24 to 19 |
| +/– goal differential per seasond | 1.05 ± 6.08 | –0.236 ± 6.62 | .415 | –1.9 to 4.4 |
| Penalty time per season, min | 41.9 ± 30.4 | 40.7 ± 29.9 | .868 | –13 to 15 |
| Even-strength goals per season, n | 8.95 ± 6.09 | 6.88 ± 5.96 | .167 | –0.89 to 5.0 |
| Power play goals per season, n | 4.27 ± 3.83 | 2.41 ± 2.67 | .026 | 0.23 to 3.5 |
| Short-handed goals per season, n | 0.697 ± 0.840 | 0.640 ± 1.58 | .854 | –0.56 to 0.68 |
| Shots per season, n | 120 ± 63.0 | 91.4 ± 58.8 | .060 | –1.2 to 59 |
| Shooting percentage per season, % | 10.5 ± 5.50 | 8.92 ± 3.84 | .187 | –0.77 to 3.9 |
| Time on ice per season, min | 983 ± 421 | 861 ± 371 | .231 | –79 to 323 |
| Time on ice per game, min | 17.0 ± 3.90 | 14.5 ± 4.27 | .021 | 0.38 to 4.5 |
aValues are expressed as mean ± SD.
bPaired-samples Student t test with Bonferroni correction (statistical significance, P < .01).
c95% CI of the difference between cases and controls.
dA measure of how the player’s team did when he was on the ice. If the player has a positive number, more goals were scored by his team when he was on the ice than allowed; if he has a negative number, his team allowed more goals than they scored when he was on the ice.