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Table 3 Genotype and allele frequencies of TPH2 gene polymorphisms between children with TD and normal controls in the male subgroup

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]

 

Male normal controls

Male TD children

   

TPH2 rs4565946

84

112

   

CC

46 (54.76)

58 (51.79)

   

CT

33 (39.29)

35 (31.25)

0.306

0.580

0.841 [0.456–1.553]

TT

5 (5.95)

19 (16.96)

4.454

0.035

3.014 [1.046–8.685]

CC + CT

79 (94.05)

93 (83.04)

   

TT

5 (5.95)

19 (16.96)

5.417

0.020

3.228 [1.153–9.040]

C

125 (74.40)

151 (67.41)

   

T

43 (25.60)

73 (32.59)

2.254

0.133

1.405 [0.900–2.193]

TPH2 rs4570625

84

112

   

TT

29 (34.52)

29 (25.89)

   

GT

40 (47.62)

50 (44.64)

0.437

0.508

1.250 [0.645–2.423]

GG

15 (17.86)

33 (29.46)

3.803

0.051

2.200 [0.990–4.888]

TT + GT

69 (82.14)

79 (70.54)

   

GG

15 (17.86)

33 (29.46)

3.497

0.061

1.922 [0.963–3.833]

T

98 (58.33)

108 (48.21)

   

G

70 (41.67)

116 (51.79)

3.942

0.047

1.504 [1.005- 2.251]

  1. Abbreviations: TPH2, tryptophan hydroxylase2.
  2. aChi-square test was used to calculate the p- values.