Table 1 Sample characteristics

From: The genetic relationship between educational attainment and cognitive performance in major psychiatric disorders

 

Cases (n = 730)b

Controls (n = 320)b

Test statistic

Degrees of freedom (df)

p-value

Age at baseline

43.19 (13.01)

37.53 (15.83)

5.62

516.11

<0.001

Sex

  

24.22

1

<0.001

Male

414 (56.7)

128 (40.0)

   

Diagnosis

 

N/A

N/A

N/A

N/A

Schizophrenia

337 (46.2)

    

Schizoaffective

73 (10.0)

    

Bipolar-I disorder

256 (35.1)

    

Bipolar-II disorder

64 (8.7)

    

Education a

  

154.11

6

<0.001

0

10 (1.4)

0 (0.0)

   

1

46 (6.3)

2 (0.6)

   

2

146 (20.0)

8 (2.5)

   

3

179 (24.5)

98 (30.6)

   

4

130 (17.8)

31 (9.7)

   

5

87 (11.9)

35 (10.9)

   

6

114 (15.6)

142 (44.4)

   

Missing

18 (2.5)

4 (1.3)

   

Duration of illness

12.93 (10.81)

N/A

N/A

N/A

N/A

Baseline treatment

 

N/A

N/A

N/A

N/A

None

23 (3.2)

    

Outpatient

355 (48.6)

    

Day patient

38 (5.2)

    

Inpatient

310 (42.5)

    

Missing

4 (0.5)

    
  1. aThe PsyCourse study measures status in the German educational system in detail. In order to make the German educational system comparable to English-speaking systems information on specialized schools, high school and professional education in Germany have been combined to form an ordinal educational scale with “6” being the highest level of education obtained
  2. bAge and duration of illness have been reported as mean (standard deviation), while all other categorical variables have been reported as n (%). A t-test was used for comparison of mean age and X2-tests were used for all categorical comparisons
  3. Socio-demographic information of participants
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