To assess headache severity, head posture, cervical muscle endurance and neck disorders.

To assess headache severity, head posture, cervical muscle endurance and neck disorders.

Headache Impact Test-6 (HIT-6) will be used to question individuals' headache. This test, which consists of 6 items, evaluates the problems that arise due to headache in a wide framework. It provides information based on the patient's self-report. The HIT-6 score ranges from 36 to 78 points. A higher score indicates more influence. Turkish validity and reliability study of HIT-6 was conducted.

Head posture will be recorded in degrees (°) by measuring the horizontal plane and the angle between the seventh cervical vertebra (C7) and the ear with an electrogoniometer (BASELINE® goniometer, Digital Absolute+Axis, Fabrication Enterprises (White Plains, New York)). None of the individuals will be informed about the head position to avoid bias in the study.

The endurance of the cervical muscles will be evaluated with the deep cervical flexor endurance test and the cervical extensor endurance test.

Neck disorders will be assessed by the Bournemouth Questionnaire (BQ) in 2002. BQ consists of 7 questions in total. Each question scores between 0 and 10. Although the highest score is 70, a high score indicates a high level of disability. The content of the questionnaire consists of variables that must be questioned for individuals with neck pain, such as pain severity, the effect of pain on activities of daily living and social life, anxiety-depression level, kinesiophobia, and coping with pain. The validity and reliability of the Turkish version of the BQ has been proven.

The Nottingham Health Profile (NHP) is a general quality of life questionnaire that measures a person's perceived health problems and the extent to which these problems affect normal daily activities. The questionnaire consists of 38 items. Questions are answered as 'yes' or 'no'. The questionnaire assesses six parameters related to health status. These parameters are; pain (8 items), physical activity (8 items), energy (3 items), sleep (5 items), social isolation (5 items), and emotional reactions (9 items). Each sub-parameter is scored between 0-100. 0 indicates best health, and 100 indicates worst health. The total NHP score is derived from the sum of the subscores.