Table 2

Case-mix in relation to seniority of surgeon

Category
Description
Surgeon
X2 (df)
P-value


Resident n (%)
Specialist n (%)



Patient gender
Male
215 (41.5)
286 (50.3)



Female
303 (58.5)
283 (49.7)
8.37 (1)
0.004






Degree of impaction of 3rd molar
Fully erupted
60 (11.6)
44 (7.7)



Partially erupted
424 (81.9)
433 (76.1)



Fully impacted
34 (6.6)
92 (16.2)
26.92 (2)
<0.001






Proximity to inferior alveolar nerve
> 2 mm
103 (19.9)
141 (24.8)



<= 2 mm
415 (80.1)
428 (75.2)
3.73 (1)
0.053






Patient age group
17–20 years
139 (26.8)
156 (27.4)



21–25 years
257 (49.6)
273 (48.0)



26–30 years
77 (14.9)
75 (13.2)



31+ years
45 (8.7)
65 (11.4)
2.74 (3)
0.434






Total number of cases treated
518 (100.0)
569 (100.0)



Jerjes et al. Head & Face Medicine 2006 2:14   doi:10.1186/1746-160X-2-14