Table 5.
Multivariate Linear Regression of Primary Clinical Outcome (12-Month Postoperative Constant Score) a
| Factor | β (Standardized β) | 95% CI | P |
|---|---|---|---|
| Demographic | |||
| Age | — | — | .84 |
| Sex | — | — | .15 |
| Delayed repair b | — | — | .19 |
| Surgical | |||
| Fixation type | — | — | .12 |
| Structural | |||
| Tear size | — | — | .78 |
| SSP length | — | — | .15 |
| FI (Goutallier) c | |||
| SSP | — | — | |
| ISP | −4.71 (–0.20) | −9.30 to –0.12 | .044 |
| SSC | — | — | .26 |
| FI (Dixon MRI) c | |||
| SSP | — | — | .84 |
| ISP | — | — | .26 |
| SSC | — | — | .97 |
| Tangent sign | — | — | .69 |
| Histological | |||
| Lipid content muscle c | — | — | .92 |
| Slow MHC-I | — | — | .71 |
| Fast MHC-II | 0.24 (0.22) | 0.026 to 0.44 | .028 |
| Hybrid MHC-I/MHC-II | — | — | .71 |
a
Dashes indicate areas not applicable. Boldface P values indicate statistical significance (P < .05). FI, fatty infiltration; ISP, infraspinatus; MHC, myosin heavy chain; MRI, magnetic resonance imaging; SSC, subscapularis; SSP, supraspinatus.
b
Delayed repair surgery was >3 months after start of symptoms or trauma.
c
Different measurement modalities of fatty infiltration were input in the regression model separately.