Abstract PTU-158 Table 1
The influence of social class on the progression of BO to OAC
Social Class
BO
OAC (observed – O)
OAC (Expected – E)
O/E
I
142
2
9.6
0.20
II
320
24
23.1
1.03
IIIN
288
11
20.1
0.55
IIIM
600
51
43.7
1.16
IV
289
18
20.6
0.87
V
185
4
12.7
0.31