Table 2 Basic demographic and clinical information of schizophrenia patients.

From: Incidence rate of schizophrenia after the Tangshan earthquake in China: a 44-year retrospective birth cohort study

Group

Birth year

No. of schizophrenia cases

No. (%) of men

No. (%) of Han

Education level I

Education level II

No. (%) of married

No. (%) of employed

Age of onset

No. (%) of familial casesa

Infant exposure group

August, 1972–

July, 1976

2786

1233

(44.3)

2733

(98.1)

979

(35.1)

1588

(57.0)

1482

(53.2)

2030

(72.9)

27.03 ± 

7.14

422

(15.1)

Fetal exposure group

August, 1976–

May, 1977

663

322

(48.6)

650

(98.0)

232

(35.0)

374

(56.4)

369

(55.7)

450

(67.9)

25.85 ± 

6.65

98

(14.8)

Unexposed

group

June, 1977–

May, 1981

2975

1429

(48.0)

2906

(97.7)

937

(31.5)

1770

(59.5)

1837

(61.7)

2031

(68.3)

25.54 ± 

6.31

454

(15.3)

  1. Note: Education Level I = Primary school or below; Education Level II = Secondary school.
  2. aHaving a positive family history of psychiatric disorders in schizophrenia patients.