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

From: Temporomandibular disorder is associated with a serotonin transporter gene polymorphism in the Japanese population

genotype TMD control
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