Intervention
headache
There were two groups randomized with 1:1 allocation using random block size administered by a data manager at the Chiropractic Knowledge Hub. Participation period was 4 months in both groups. Parents and children were blinded for group allocation. All parents and children were given written and oral advice on general lifestyle generally believed to be beneficial to reduce headache. This regarded regular meals, enough liquid and sleep, reduction of screen time and at least half an hour of physical activity per day. This information was given before allocation.The intervention group received chiropractic manipulation, a high-velocity, low-amplitude thrust resulting in an audible cavitation directed at specific, individually identified, dysfunctions of one or more joint(s) in the spine, pelvis and/or temporomandibular joint. All treatments were modified to fit age, size, and the individually identified dysfunctions of each child, as were the number of treatments [The control group received sham manipulation treatment, where a patient placement similar to the one used in the intervention group was used, but in this group only gentle pushes with a broad, non-specific contact away from the spinal column were given with no resulting cavitation. This method followed a previously validated protocol by Chaibi et al. [More details can be found in the published protocol [