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Table 2 Genotype and Allele frequencies of TPH2 gene polymorphisms between children with TD and normal controls

From: Involvement of tryptophan hydroxylase 2 gene polymorphisms in susceptibility to tic disorder in Chinese Han population

Polymorphisms

Number and frequency (%)

χ 2

P a

OR [95% CI]

 

Normal controls

TD children

   

TPH2 rs4565946

125

149

   

CC

65 (52.00)

78 (52.35)

  

1.00

CT

53 (42.40)

48 (32.21)`

1.168

0.28

0.755 [0.453–1.258]

TT

7 (5.60)

23 (15.44)

4.994

0.025

2.738 [1.105–6.788]

CC + CT

118 (94.40)

126 (84.56)

  

1.00

TT

7 (5.60)

23 (15.44)

6.745

0.009

3.077 [1.273–7.437]

C

183 (73.20)

204 (68.46)

  

1.00

T

67 (26.80)

94 (31.54)

1.474

0.225

1.259 [0.868–1.825]

TPH2 rs4570625

125

149

   

TT

44 (35.20)

37 (24.83)

  

1.00

GT

57 (45.60)

75 (50.34)

2.498

0.114

1.565 [0.897–2.730]

GG

24 (19.20)

37 (24.83)

3.127

0.077

1.833 [0.934–3.599]

TT + GT

101 (80.80)

112 (75.17)

  

1.00

GG

24 (19.20)

37 (24.83)

1.246

0.264

1.390 [0.779–2.483]

T

145 (58.00)

149 (50.00)

  

1.00

G

105 (42.00)

149 (50.00)

3.499

0.061

1.381 [0.984–1.937]

  1. Abbreviations: TPH2 = tryptophan hydroxylase2.
  2. a Chi-square test was used to calculate the p-values.