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This retrospective study aimed to evaluate the differences in abdominal temperature (AT) between fertile (n=206; age) and infertile (n=250) women between the ages of 30 and 39 years. We evaluated the differences in two distinctive skin temperatures by thermography: ΔT₁ (CV8 index) – difference in temperature between the mid-abdomen (CV8 acupuncture area) and ventral upper arm (VUA) and ΔT₂ (CV4 index) – difference in temperature between the lower abdomen (CV4 acupuncture area) and VUA. The results indicated that the ΔT₁ and ΔT₂ of infertile women were significantly lower (by 1.05 °C and 0.79 °C, respectively; p<0.001, both) compared to those of fertile women. Additionally, the area under the curve of ΔT₁ (0.78) was greater compared to that of ΔT₂ (0.736), and its threshold was set at 0.675 °C, by which, the sensitivity and specificity of ΔT₁ for determination of fertility were found to be 80.8% and …