Haoxiang Su, Zhenghong Dong, Yi Liu, Yao Mu, Sen Li, Lurui Xia
Symmetric projection optimizer: concise and efficient solving engineering problems using the fundamental wave of the Fourier series
Scientific reports
little known pathological internet use piu online risky behaviors among elementary school children aimed investigate prevalence factors associated piu online risky behaviors schoolbased crosssectional study conducted toyama japan 2018 study included 13413 children 4th6th grades mean 105 years old 110 elementary schools 611 elementary schools toyama assessed piu using youngs diagnostic questionnaire ydq risky behaviors poisson regression analysis conducted totally 13092 children returned questionnaires response rate 976 prevalence piu 42 risky behavior follows 216 spending money online 66 uploading personal movies 52 interpersonal issues 24 met strangers piu significantly associated boys prevalence ratio pr 126 95 confidence interval ci 104152 skipping breakfast pr 143 95 ci 114179 internet time 23 h pr 349 95 ci 263465 34 h pr 445 95 ci 327606 4 h pr 825 95 ci 6451055 physical inactivity pr 263 95 ci 200347 late bedtime pr 186 95 ci 145239 11 pm rules home pr 122 95 ci 101146 childparent interaction pr 137 95 ci 106177 close friends real life pr 169 95 ci 130219 piu risky behaviors rare among elementary school children besides unhealthy lifestyles social family environments associated piu childparent interaction helping children develop close friendships real life effective deterrents piu