TABLE 2.
Demographic Correlations to Outcome Scoresa
| Demographic | PSQI | VAS | ASES | |||
|---|---|---|---|---|---|---|
| Correlation (r) | Significance (P) | Correlation (r) | Significance (P) | Correlation (r) | Significance (P) | |
| Age | 0.004b | .95 | 0.06b | .37 | 0.05b | .47 |
| Sex (male vs female) | –0.13c | .06 | 0.12c | .09 | –0.01c | .90 |
| Chronicity (categorical) | 0.22d | .002 | 0.03d | .66 | 0.03d | .68 |
| Smoker (yes vs no) | 0.09c | .19 | 0.07c | .35 | –0.06c | .36 |
| Side dominance | –0.01c | .93 | 0.02c | .73 | –0.06c | .43 |
aBolded data indicate statistically significant value (P < .05). ASES, American Shoulder and Elbow Surgeons; PSQI, Pittsburgh Sleep Quality Index; VAS, visual analog scale.
bPearson correlation coefficient (both variables are continuous).
cPoint biserial correlation coefficient (one variable is dichotomous [nominal: yes or no], and the other is continuous).
dSpearman rank-order correlation coefficient (one variable is continuous, and the other is ordinal [ranked]).