Statistical analysis
Data were expressed as the mean and standard deviation for comparison
between the presence and absence of accessory maxillary sinus ostia in
superior meatus in both left and right sides of the maxillary sinus.
Statistical analysis was performed using one-way analysis of variance
and Tukey test (SigmaPlot 12.5), with a P value of <0.05
considered statistically significant. Sample size calculations were
based on an alpha of 0.05 and a power value of 0.99.