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Table 1 Genotypic frequencies of subjects enrolled in the study and the prevalence of skewed X chromosome inactivation

From: A new sex-specific underlying mechanism for female schizophrenia: accelerated skewed X chromosome inactivation

Group 1

Group 2

Total no. of women enrolled in the study

Age (mean and standard deviation)

No. of women heterozygous at the HUMARA locus

No. of individuals with skewing ≥75%

% of skewing ≥75%

OR

CI

p-value

No. of individuals with skewing ≥80%

% of skewing ≥80%

OR

CI

p-value

CNTL

SUM

80

28.61±14.6

80

10

12.5

   

5

6.25

   
 

Child

20

13.35±4.65

20

1

5

   

0

0

   
 

Adult

47

27.23±3.67

47

6

12.2

   

3

6.1

   
 

Elderly

13

57.07±7.27

13

3

23

   

2

15.3

   

SCZ

SUM

109

27.7±15.00

101

29

28.7

2.8

1.2-6.2

p=0.01

20

19.8

3.7

1.3-10.3

p=0.009

 

Child

45

15.12±2.14

39

6

15.3

3.4

0.4-3.8

p=0.404

3

7.6

1.5

0.8-1.0

p=0.156

 

Adult

48

27.89±4.39

46

18

39

4.3

1.3-12

p=0.005

14

30

6.4

1.7-24

P=0.006

 

Elderly

16

57.81±7.23

16

5

31

1.5

0.3-8.0

p=0.67

3

19

1.2

0.18-9.0

p=0.81

MDD

SUM

38

38.31±15.3

38

7

18.4

1.8

0.6-5

p=0.392

6

15.7

1.7

0.4-6.9

p=0.1

 

Adult

22

25.86±4.15

22

4

18

0.7

0.4-6.0

p=0.714

4

18

3.2

0.6-16

p=0.192

 

Elderly

16

55.44±4.37

16

3

19

0.8

0.1-4.6

p=1

2

13

1.1

0.16-8.1

p=1

  1. Considered skewed if the inactivation of the predominant allele was ≥75% or 80%, ORs and values for patients vs the age-matched heathy control group. SCZ vs CNTL, p<0.05*; age group SCZ vs CNTL, p<0.0167 * or age group MDD vs CNTL, p<0.025* by Fisher’s exact test or the chi-squared test. OR=odds ratio CI= confidence interval