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Box and Whiskers plot of seminal plasma NAD+-IDH levels (mU/ml) among the studied groups. The median and interquartile ranges (25th −75th percentile) are shown as solid horizontal lines and the means of all groups are connected. Participants exposed more to radiofrequency waves (groups C and D: 2–4 h/day and >4 h/day, respectively) had a significantly higher mean isocitrate dehydrogenase level; IDH (mU/ml) compared with the other groups (overall P < 0.001).
