The average number of daily calls using cordless phones and the average duration of each call were 2.46±4.71 (ranged 0-17) and 9.27±25.77 minutes (ranged 0-180 minutes), respectively. Mobile Phones In regards to the status of using mobile phones, as the most important source of exposure to electromagnetic fields, 310 out of 452 (68.58%) students who answered the questions, did not have the history of using mobile phones, while 142 (31.42%) had used such phones. It was revealed that male students had owned mobile phones much more than the female students. The relative frequency of using mobile phones in male students

was 34.7%, while in the case of female students it was Inhibitors,research,lifescience,medical only 28.6%. In this regard, Chi square test Bcr-Abl pathway showed a statistically significant difference (P<0.05). It was also shown that male students had used mobile phones more frequently than female students. The frequency of the male students using their mobile phones in talk mode for a period longer than 10 minutes/day was 16.7%, Inhibitors,research,lifescience,medical while it was 11.0% in the case of female students. Inhibitors,research,lifescience,medical Again, this difference was statistically significant (P<0.05). Among the owners of mobile phones, 89.33% had only one receiver, 9.33% had two receivers and 1.33% had three receivers. The average daily time of using mobile phones in standby mode was 4.97±9.03 hours, while the average daily time of using mobile phones

in talk mode was 7.08±21.42 minutes. In this regard, 86.1% and 91.4% had used mobile phones less Inhibitors,research,lifescience,medical than 10 and between 10 to 20 minutes per day, respectively. The places of mobile phones in standby mode were waist (23.4%), chest (6.5%), and bags or other locations (70.1%). The places of mobile phones in talk mode Inhibitors,research,lifescience,medical were ears (88.9%), waist using hands free (9.2%), and chest or pockets (2.0%). After conducting a Chi square test, statistically significant higher prevalence of self-reported symptoms such as headache (P=0.009, table 1), myalgia (P=0.0002,

table 2 ), palpitation (P=0.0001, table 2), fatigue (P=9×10-8, table 2), tinnitus (P=0.0005, table 3), concentration problems (P=0.0001, table 3), attention problems (P=0.0002, table 3) Oxymatrine and nervousness (P=9×10-8, table 3) was found in students who had used mobile phones compared to those never used these phones. Table 1 The frequency and rate of headache, as a self-reported symptom, in mobile phone users (three different levels of use) and those who did not use mobile phones. Table 2 The frequencies and (rate) of myalgia, palpitation and fatigue as self-reported symptoms in mobile phone users (two different levels of use) and those who did not use mobile phones. Table 3 The frequency and rate of tinnitus, concentration problem, attention problem and nervousness, as self-reported symptoms, in mobile phone users (two different level of use) and those who had not used mobile phones.