Main symptoms Numbers (Percentages) (n=441) Headache 227(51.5) Irritability 224 (50.8) Lack of concentration 209 (47.4) Anxiety 170 (38.5) Eye strain 161 (36.5) Lack of sleep 156 (35.4) Exhaustion 144 (32.7) Body ache 142 (32.2)

Table 2: Some of the principal adverse health effects of cell phone usage, in descending order of occurrence.