Table 4. Odds ratio (OR) of duration time of headache and their 95% confidence intervals for each factor and daily dose adjusted for all other factors using GEE (AR1, QIC=3473.75, QICC=3458.362)

From

New Trend of Headaches among High School Students Affected by Smartphone Electromagnetic Pollution Exposures: A Time Series Study

Wanna Chongchitpaisan, Phongtape Wiwatanadate, Surat Tanprawate, Assawin Narkpongphan, Nipapon Siripon

American Journal of Public Health Research. 2019, 7(4), 161-166 doi:10.12691/ajphr-7-4-6