Table 2.

Distribution of study participants (patients diagnosed with temporomandibular disorders [TMDs] and control patients without TMDs) regarding normal limits of serum parathyroid hormone and vitamin D.

Biochemical parameter	TMDs group(n = 50)	Control group(n = 50)	Statistical significance
PTH (normal/high)	18/32	35/15	P = 0.001
25 (OH) Vit D3 (normal/low)	7/43	10/40	NS

Data presented an n patient prevalence.

PTH, parathyroid hormone (normal range, 10–65 pg/ml); 25 (OH) Vit D3, 25 hydroxy vitamin D3 (normal range, 20–100 ng/ml).

NS, no statistically significant between-group differences (P > 0.05; χ²-test).