This question has been asked previously but there has been a new study on the question which has received publicity and considerable acceptance. I am skeptical of the findings of the new study.
Men using mobile phones at a high frequency (>20 times a day) showed a 21% reduction in sperm concentration and a 22% TSC decrease as compared to those who rarely (less than once per week) used mobile phones. Significant exposure-response trends were observed across the complete exposure range in this group of men. Moreover, these men also showed a higher risk of having a sperm concentration and TSC below the WHO reference value for fertile men. The likelihood of having a lower-than-WHO-reference sperm concentration was significantly higher in men using mobile phones 5–10 times a day than those who rarely used it in the day or week (adjusted odds ratio = 1.409).
In the present study, 5,605 men aged 18–22 years were surveyed across six centers in the country using questionnaires regarding their health and lifestyle as well as their parents’ preconception period. The men were also asked about the duration and frequency of mobile use (rarely, a few times per week, 1–5 times per day, 5–10 times per day, 10–20 times per day, >20 times per day) and the place where they kept the phone (in a jacket pocket, pant pocket, belt carrier, or elsewhere) when not in use.
The report goes on to admit of severe limitations in the process carried out to determine the thesis:
there are a few limitations to the study. It did not evaluate the daily RF-EMF absorption and relied solely on self-reported data for surveying mobile usage. Also, the characteristics of the phone, such as its brand, number of applications, network quality, use of ear accessories, and output power, were not recorded.
Is there any evidence, other than this recent, well-publicised evaluation (one is tempted to refer to 'click-bait') to support the claims and to really come to the conclusion that heavy mobile phone use is a major factor in sperm reduction?
There is a range of other factors, globally, which could be the cause of sperm reduction, such as drinking water pollution by pharmaceuticals. Is there a definite attempt to draw attention away from such (financially sensitive) effects and to blame mobile phone use?