Participants who reported daily mobile phone use of 1 hour or less were classified as unexposed.
|Reference group 1||mobile phone use: ≤ 1 hour per day (unexposed)|
|Group 2||mobile phone use: > 1 hour per day|
|Group 3||mobile phone use: < 10 years|
|Group 4||mobile phone use: ≥ 10 years|
|Group 5||preferred ear while using mobile phone: left|
|Group 6||preferred ear while using mobile phone: right|
Overall 18 out of 26 patients (69.2%) were exposed to daily mobile phone usage of more than 1 hour, whereas 24 out of 61 controls (39.3%) used their mobile phones more than 1 hour per day.
A statistically significant association was observed between parotid gland tumor and a daily mobile phone use of more than 1 hour compared to a daily mobile phone use of 1 hour or less (crude OR 3.47, CI 1.3-9.23; OR adjusted for age: 2.86; CI 1.03-7.97). No associations were observed for long-term use (> 10 years) and ipsilateral use.
The author concluded that an association between parotid gland tumor and mobile phone use for more than 1 hour daily in comparison to 1 hour or less per day was observed.
The findings should be interpreted with caution because of the small sample size.