Frequency of distribution

G₂

G₁

B₂

B₁

Total

WR (n = 64)

0

0

9 (14.06%)

16 (25%)

22 (34.38%)

ER (n = 59)

0

0

3 (5.08%)

11 (18.64%)

12 (20.34%)

SA (n = 123)

0

0

12 (9.76%)

27 (21.95%)

34 (27.64%)