Table 4 Multiple logistic regression on final immune status (N = 2905)

Sex

 Female

1.000

–

–

–

 Male

0.864

0.178

0.699

1.069

Impact of national policy

 Up to 12/31/1977

1.000

–

–

–

 Beginning 01/01/1978

0.423

0.002

0.214

0.695

Age-group

 18–20

1.000

 21–30

1.567

0.174

0.821

2.978

 31–40

3.041

0.001

1.538

6.014

 41–50

9.846

0.001

2.627

36.910

 51–60

12.155

0.001

2.261

42.963

 61–70

Vocation

 Nurses

1.000

–

–

–

 Doctors

1.177

0.204

0.916

1.512

 Examination

0.975

0.044

0.315

0.998

 Preventive and long-term care service

1.261

0.368

0.761

2.090

 Administration

1.092

0.464

0.862

1.384