Table 1 Genotype distribution data (upper panel) and allele frequency data (lower panel) for 5HTTLPR from TMD patients and controls.

5HTTLPR

n = 36

n = 119

s/s

17 (47.2%)

87 (73.1%)

s/l

14 (38.9%)

29 (24.4%)

l/l

4 (11.1%)

2 (1.7%)

s/xl

1 (2.8%)

1 (0.8%)

p value

Pearson's χ² test

0.0079

Fisher's exact test

0.0044

allele

TMD

control

5HTTLPR

n = 72

n = 238

s

49 (68.1%)

204 (85.7%)

l

22 (30.5%)

33 (13.9%)

xl

1 (1.4%)

1 (0.4%)

p value

Pearson's χ² test

0.0027

Fisher's exact test

0.0019