Time of diagnosis

N

Qualification

Months

156

8.34 ± 1.50

1 year

110

8.69 ± 1.28

2 to 5 years

325

8.73 ± 1.37

6 to 9 years

147

8.80 ± 1.48

10 o more years

175

8.96 ± 1.91