Table 3. Average horizontal width in mm of the alveolar ridge at the premolar, I molar, and II molar areas.

Site	No. of patients	Average horizontal width (mm)
Premolar	40	6.22±1.96
I (1st) molar	40	6.51±1.75
II (2nd) molar	40	7.60±2.08

Values are presented as number or mean±standard deviation.