A large Finnish cross-sectional study on school-age adolescents published in 2012 concluded that more than two hours a day spent on computers was associated with a moderate/severe increase in musculoskeletal pain [REF].
Based on these surveys of neck pain prevalence, and adding to them the prevalence of thoracic pain and cervicogenic headache, it is reasonable to estimate that around one adult in six (15%) probably has pain in any, some or all of those areas right now [REF].