Fit of PFL racial norms (n=42)
| PFL norm | Mean PFL Z-score | 95% CI |
| African American (Iosub) | −2.14 | −2.33 to −1.95 |
| Caucasian (Hall) | −0.76 | −1.13 to −0.38 |
| Canadian (Clarren) | 0.93 | 0.54 to 1.31 |
| Scandinavian (Strömland) | 0.34 | −0.04 to 0.73* |
*Not significantly different to 0 (p>0.05; from one-sample t-test).
PFL, palpebral fissure length.