Table 1

 Comparison of the ultrasonographic (US) and demographic characteristics of clinically suspicious naevi

Clinically suspicious naevi characteristicBenign naevi (n = 148)Premalignant naevi (n = 17)p Value benign v premalignant
*SD, standard deviation.
Which eye (% of naevi in the left eye)43.2%54.5%p = 0.5 (χ2 test)
Location in the eyePosterior pole57.6%70.6%p = 0.44 (χ2 test)
Superior retina47.0%56.3%p = 0.64 (χ2 test)
Nasal retina33.3%50%p = 0.27 (χ2 test)
First US examinationThickness (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 examinationThickness (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 testThicknessp = 0.0001p = 0.009
Largest base diameterp = 0.2p = 0.56
Base areap = 0.02p = 0.01
Internal reflectivityp = 0.47p = 0.03