Participants in the intervention group will receive 'Turkish PNE4Kids Programme'. The PNE4Kids program was developed based on the book "Explain pain" by Butler and Moseley and includes an explanation and reassurance on the cause of pain, a brief summary of relevant pain mechanisms, and the integral role of psychosocial and physical factors in precipitating and maintaining pain. This programme has been translated and validated in Turkish children.

Children's physical activity levels will be assessed with the "Physical Activity Questionnaire for Older Children (PAQ-C 8-14)". The scale is an assessment tool that children can self-administer, developed by Crocker et al (Crocker et al., 1997) for children in the 4th to 8th grades. There is also a form of the same scale developed for adolescents (Kowalski et al., 1997). The physical activity scale developed for older children has a total of 10 items based on a 5-point Likert scale (1 point: lowest, 5 points: highest) that measure children's physical activity levels in the last week.

In order to evaluate children's sleep prices, the Child Sleep Habits Questionnaire-short formulas, which were separated by Owens and colleagues (Owens et al., 2000) in 2000 and comprehensively covering children's sleep quality and sleep conduction, will be used (Owens et al., 2000). The questionnaire, which can be done in Turkish and has been made reliable by Balık et al. (Fis et al., 2011), consists of a total of 33 items. The total score of 41 is accepted as the cut-off point and values above this are evaluated as 'clinically significant sleep disturbance'.

Children's pain concept (pain knowledge, beliefs and attitudes towards pain) levels will be assessed with the "Pain Conceptualization Scale (COPI)".

The Pain Conceptualization Scale is a 14-item scale developed by Pate et al (Pate et al., 2020) to assess children's pain knowledge, beliefs and attitudes towards pain. This scale includes pain-related items based on 7 areas suggested by pediatric pain specialists. Each item is evaluated according to a 5-point Likert Scale ranging from "strongly agree (4 points)" to "strongly disagree (0 points)".

Higher scores indicate higher levels of compliance with pain science.

Children's participation in leisure activities will be assessed through the participation section/domain of the Participation Environment Measure for Children and Youth (PEM-CY) (Coster et al., 2011). The participation section in the PEM-CY consists of 10 items for home environments, 5 items for school environments, and 10 items for community environments. This scale will be administered by the children's parents.

Children's school attendance will be evaluated with the "e-school absence tracking" (Golcuk, 2015) system. This information will be requested from the school administration. Beforehand, parents will be contacted by phone and their consent will be obtained with the Personal Data Protection (PDPL) Informed Consent Form.