TRPC3 and intervertebral disk degenerative disorder: The result of the calculations indicated that trp3 polymorphism had no associations to IDD risk in any ethnicity (as shown in Fig. 2c and Table 4, for Asian subgroup, trp3 positive versus trp3 negative: ORs = 1.22, 95%CI = 0.52–2.89, P = 0.645; heterogeneity test χ2 = 1.53, P > 0.10, I2 = 34.70%.