Table 1 Comparison of the ultrasonographic (US) and demographic characteristics of clinically suspicious naevi.
| Clinically suspicious naevi characteristic | Benign naevi (n = 148) | Premalignant naevi (n = 17) | p Value benign v premalignant | |
|---|---|---|---|---|
| Which eye (% of naevi in the left eye) | 43.2% | 54.5% | p = 0.5 (χ2 test) | |
| Location in the eye | Posterior pole | 57.6% | 70.6% | p = 0.44 (χ2 test) |
| Superior retina | 47.0% | 56.3% | p = 0.64 (χ2 test) | |
| Nasal retina | 33.3% | 50% | p = 0.27 (χ2 test) | |
| First US examination | Thickness (mm (SD*)) | 1.74 (0.53) | 2.19 (0.40) | p = 0.001 (t test) |
| Largest base diameter (mm (SD)) | 6.1 (2.0) | 7.1 (1.9) | p = 0.05 (t test) | |
| Base area (mm2 (SD)) | 27.2 (16.3) | 34.0 (13.9) | p = 0.1 (t test) | |
| Internal reflectivity (% (SD)) | 71.2 (15.8) | 57.5 (24.3) | P = 0.002 (t test) | |
| Last US examination | Thickness (mm (SD)) | 1.49 (0.56) | 2.85 (0.92) | p<0.0001 (t test) |
| Largest base diameter (mm (SD)) | 6.4 (2.1) | 7.6 (3.0) | p = 0.03 (t test) | |
| Base area (mm2 (SD)) | 32.1 (19.4) | 53.6 (26.7) | p = 0.0001 (t test) | |
| Internal reflectivity (% (SD)) | 72.6 (18.0) | 40.8 (18.1) | p<0.0001 (t test) | |
| p Value (last v first US examination) t test | Thickness | p = 0.0001 | p = 0.009 | |
| Largest base diameter | p = 0.2 | p = 0.56 | ||
| Base area | p = 0.02 | p = 0.01 | ||
| Internal reflectivity | p = 0.47 | p = 0.03 | ||
*SD, standard deviation.