I have headaches due to excessive smartphone use

−0.034

0.116

0.110

0.154

0.589

My shoulders are stiff due to excessive smartphone use

0.124

0.197

−0.053

0.214

0.678

I feel pain in the wrists or back of the neck when using a smartphone

0.150

0.083

0.175

−0.082

0.603