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 |