Table 3 Results of the logistic regression analysis for specialty changes in the classes of 1970, 1980 and 1990

Class of 1970

N = 2,706

Class of 1980

N = 6,326

Class of 1990

N = 6,994

Sex (base category; men)

1.5 (1.3 – 1.7)

1.4 (1.3 – 1.5)*

1.3 (1.2 – 1.4)*

Age at first registration

ns

ns

ns

Specialty

Paediatrics

1.8 (1.6 – 2.0)*

2.1 (2.0 – 2.2)*

ns

(base category; internal medicine)

General surgery

11.2 (11.1 – 11.3)*

7.2 (7.1 – 7.3)*

3.7 (3.6 – 3.8)*

Neurosurgery

3.9 (3.6 – 4.2)*

2.5 (2.3 – 2.7)*

ns

Respiratory surgery

na

17.1 (16.6 – 17.6)*

Cardiovascular surgery

11.6 (11.2 – 12.0)*

5.6 (5.4 – 5.8)*

Paediatric surgery

11.3 (10.7 – 11.9)*

8.3 (7.7 – 8.9)*

Orthopaedics

1.8 (1.7 – 1.9)*

1.4 (1.3 – 1.5)*

ns

Plastic surgery

3.9 (3.6 – 4.2)*

ns

Obstetrics and gynaecology

ns

ns

0.3 (0.1 – 0.5)*

Ophthalmology

ns

0.4 (0.2 – 0.6)*

0.2 (0.0 – 0.4)*

Otolaryngology

0.5 (0.2 – 0.8)

0.6 (0.4 – 0.8)*

0.4 (0.2 – 0.6)*

Dermatology

ns

ns

0.6 (0.4 – 0.8)

Urology

ns

2.0 (1.8 – 2.2)*

ns

Rehabilitation

7.9 (7.2 – 8.6)*

Radiology

10.7 (10.3 – 11.1)*

4.8 (4.6 – 5.0)*

1.8 (1.6 – 2)*

Anaesthesiology

8.0 (7.6 – 8.4)*

2.9 (2.8 – 3.0)*

1.7 (1.6 – 1.8)*

Psychiatrics

2.7 (2.5 – 2.9)*

1.6 (1.5 – 1.7)*

1.1 (1.0 – 1.2)

Others

69.4 (68.4 – 70.4)*

19.6 (19.3 – 19.9)*

13.9 (13.7 – 14.1)*

Working area

Intermediate area

0.8 (0.7 – 0.9)

ns

ns

(base category; urban area)

Rural area

ns

ns

ns

Work facility

Hospitals

0.7 (0.5 – 0.9)

0.6 (0.5 – 0.7)*

0.5 (0.3 – 0.7)*

(base category; clinics)

Others

0.1 (-1.0 – 1.2)

0.1 (-0.3 – 0.5)*

0.3 (0.0 – 0.6)*