Stephanie W Cawthon, Elizabeth Barker, Johny Daniel, North Cooc, Ana G Vielma
Longitudinal Models of Reading and Mathematics Achievement in Deaf and Hard of Hearing Students
Journal of deaf studies and deaf education
potential differential nondifferential recall error mobile phone use mpu multinational mobikids casecontrol study evaluated compared selfreported mpu network operator billing record data 3 months 1 year 2 years interview date 702 subjects aged 10 24 years eight countries spearman rank correlations kappa coefficients geometric mean ratios gmrs used material differences mpu recall estimates cases controls observed spearman rank correlation coefficients selfreported recorded mpu recent 3 months 057 059 call number call duration respectively number calls average underestimated participants gmr 069 duration calls overestimated gmr 159 country years since start using mobile phone age time interview sex appear influence recall accuracy either call number call duration trend recall error seen level selfreported mpu underestimation use lower levels overestimation use higher levels number duration calls although systematic random errors selfreported mpu among participants observed evidence differential recall error cases controls nonetheless sources exposure measurement error warrant consideration interpretation mobikids casecontrol study results association childrens use mobile phones potential brain cancer risk