Design and validation of appearance and content of an oral health questionnaire for parents or caregivers of children with cerebral palsy

Affiliations: 1School of Dentistry, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile. 2Instituto Nacional de Rehabilitación Pedro Aguirre Cerda. 3Faculty of Medicine and Dentistry, Universidad de Valencia, Spain. 4Faculty of Dentistry, Universidad de Chile, Santiago, Chile. Corresponding author: Daniel CarreñoHenríquez. Pontificia Universidad Católica de Chile, Avda Vicuña Mackenna 4860, Macul, Santiago, Chile. Phone: (56-2) 3548400. E-mail: dcarrenoh@uc.cl Abstract: Introduction: Cerebral palsy is a syndrome that involves a large number of childhood movement and posture disorders, resulting in activity limitation. It is attributed to non-progressive alterations in the fetal or infant brain. This disorder can also be accompanied by oral alterations, some of which can be prevented if the caretaker knows how to manage them. An adequate knowledge of oral health on the part of the caregivers has a positive impact on the oral status of their patients. Objective: To design and validate a questionnaire to assess the oral health knowledge of caregivers of children with cerebral palsy. Methods: A literature search was conducted to identify published questionnaires on oral health knowledge related to people with disabilities. In the absence of questionnaires in Spanish, the search was focused on other surveys aimed at parents of healthy children. Validation of appearance and content was carried out by a panel of experts and a group representing the target population. Subsequently, two pilot studies were carried out to determine the questions that would make up the final instrument, analyze the need to modify its wording and establish alternative answers. Results: The designed questionnaire was approved by the panel of experts and by the representatives of the population at whom the instrument is aimed. After two pilot studies, a Cronbach's alpha of 0.83 was obtained. Conclusion: The designed and validated questionnaire has good internal consistency. It is necessary to evaluate its reliability so that it can be used clinically and in research studies.

Clinical characteristics of CP can negatively affect patients' oral health, increasing their risk of developing oral disease.
Children with CP have an increased risk of dental caries mainly due to motor disorders that affect their ability to maintain adequate oral hygiene, and to cognitive deficits that affect their ability to cooperate when receiving oral care. A higher prevalence of gingivitis has been reported in these patients as they find it difficult to properly brush their teeth and also suffer from intraoral hypersensitivity; both these factors contribute to the accumulation of biofilm. Moreover, children with CP are more prone to dental injuries, with a prevalence raging from 10% to 60%, usually accompanied by seizures, malocclusion and labial incompetence. They may also present dentomaxillary anomalies, mainly overbite or anterior open bite, which increase in severity as the child ages. 4 On the other hand, studies on the relationship between the oral health knowledge of parents and their children's oral health status 5, 6 have reported that parents should have basic notions of oral health care so that they can help prevent their children from developing oral pathologies. 7, 8 Although there are specialized centers where children with CP receive dental care, programs to specifically educate about oral health care have not been implemented for the patients parents and/or caregivers. This is why it is necessary to assess whether caregivers of children with disabilities have a basic knowledge of oral health and are adequately trained to provide the necessary care. The objective of this study was to design a questionnaire to assess the oral health knowledge of caregivers of children with cerebral palsy. It is important to bear in mind that there are no studies in Spanish focused on this matter and population. A further objective could be to design an educational program on oral health focused exclusively on these patients.

MATERIALS AND METHODS.
Prior to the elaboration of the questionnaire, a literature search was carried out in order to identify if similar instruments were available in the literature. PubMed, Cochrane Library and EMBASE databases were selected. Inclusion criteria included articles in English and Spanish published between 1994 and 2014 that described questionnaires designed to determine the oral health knowledge of parents and/or caregivers of children with cerebral palsy or another disability; the instrument had to be published in full. To identify the studies considered in this review, specific search strategies were employed for each database. Keywords used ("MESH") for the search were, among others, "Carer", "Parents", "Cerebral palsy", "Oral health knowledge", "Parental oral health knowledge", "Questionnaire", "Survey" and "Learning disability." Studies that meet the inclusion criteria and whose title and abstract did not provide sufficient information were fully analyzed by the author of this review. As a result of this first search, no published and validated questionnaires were found that could help determine the degree of the oral health knowledge of parents and/or caregivers of children with cerebral palsy or any other disability. For this reason, a new search was carried out with the aim of finding articles including questionnaires that assessed the oral health knowledge of parents and/or caregivers of children without disabilities. Articles written in English were found, and those that included a complete sample of the questionnaire were selected. Then, an inventory of questions from the publis-hed questionnaires was drawn up with and they were informally translated into Spanish.
All the questions related to relevant oral health aspects of people with cerebral palsy were selected. New questions were also created to cover those topics not originally considered. In this way, the resulting instrument included questions that specifically addressed the characteristics of the population to be evaluated.
Two specialists in the care of people with cerebral palsy were requested to assess validation of appearance of the proposed questionnaire.
Content validation was carried out on two levels: judgment of expert professionals and of representatives of parents and caregivers of children with cerebral palsy.
A panel of experts in the care of people with cerebral palsy and special needs evaluated the content of the questionnaire, the relevance of the questions, the wording, the relationship with the construct and its clinical application. Additionally, they used a digital form to keep a record of their suggestions and criticisms.
Then, a group of parents and/or caregivers of children, between 1 and 17 years of age with cerebral palsy, read the questionnaire and reported their opinions through a semi-structured interview. Saturation was reached at ten participants. Selection criteria for the validation of content by parents and/or caregivers were the following: Having a dependent child with cerebral palsy aged between 1 and 17 years; willingness and availability to analyze the questionnaire (9 to 10 minutes to answer and 10 minutes to report their opinions). All parents who participated in the validation of the content attended a rehabilitation center for patients with cerebral palsy that provided dental care. At the time of the interview, each parent or caregiver was provided with a questionnaire and its objective was explained. Once the parent and/or caregiver finished reading the questionnaire, a feedback questionnaire was provided including directed and open questions, whose objective was to know their opinion about the instrument and the degree of difficulty in answering it. They were asked to point out if there was a term too complex or any particularly difficult question and why; to give their opinion regarding the length of the questionnaire (number of questions); and finally, if they thought that the questions were focused on relevant aspects of the oral health care of their dependent child.
Once suggestions and answers to the open questions were analyzed, a preliminary questionnaire of 20 questions was obtained with seven alternatives from totally disagree to fully agree.
The study was approved by the Ethics Committee of the East Metropolitan Health Service of Santiago, Chile.
A pilot study was carried out. The questionnaire

Characteristics of the instruments included for the elaboration of the instrument Authors
Year Target group Number of Measured concept Oral health aspects questions evaluated Richards W. 2014 Professionals in the 9 Perceptions of the target group in relation Prevention of caries et al. 7 dentistry field. to relevant oral health situations in order to Prevention of periodon-Healthcare professio-demonstrate inconsistencies or lack of tal disease nals/providers. know ledge between and within these Prevention of dental General public.
groups in relation to oral disease risk factors. erosion Chhabra A. 2012 Parents of children 23 Knowledge, attitude and beliefs of parents Oral hygiene habits; Role et al. 10 between 1 and 4 in relation to oral health and dental care of of parents inoral hygiene; years old in an Indian their children aged between 1 and 4 years. Diet patterns; Knowledge population about health and dental problems; Attitude of parents towards dentists; Awareness of dental visits; Social and cultural beliefs that affect decision making regarding dental treatment. Saied -2008 Mothers of 9-year-old 14 Influence of oral health knowledge and Aspects related to bac-Moallemi children attitudes of mothers on the hygiene habits terial plaque, causes and Z. et al. 27 and dental health of their children. prevention of oral diseases; Importance of oral health and relevance of oral diseases. Arrow P.

RESULTS.
The literature search yielded 50 articles, from which two duplicates were excluded. None met the inclusion criteria, and a new broader search was carried out in order to find questionnaires focused on assessing the oral health knowledge of both parents and/or caregivers of children without disability aged between 1 and 17 years. This search yielded four articles published in English. Three were studies containing a previously validated questionnaire; the other one was a protocol in which the questionnaire to be used in a future study was presented.
All the selected studies reported the questions and the form of evaluating the construct comprehensively. Table  1 summarizes the relevant information in relation to the questionnaires obtained through the literature search ( Table 1).
The most relevant items related to the different components of oral health of the target patients were selected (knowledge of caries, periodontal disease, oral hygiene habits and poor oral habits). The necessary changes were made to adapt them to the target population of the questionnaire.
Because the selected questionnaires did not cover all the important aspects required to assess the degree of oral health knowledge of parents and/or caregivers of children with cerebral palsy or any other disability, it was necessary to design new questions to be added.
A new questionnaire was designed consisting of two parts. The first section was composed of 20 closed response questions in a 7-point Likert scale, whose purpose is to determine the knowledge of parents and/or caregivers of children with cerebral palsy aged between 1 and 17 years regarding aspects of oral health directly related to their condition. The second section focused on demographic aspects such as parent and/or caregiver age, kinship, gender, level of education and district of residence.
The panel of experts stated that the questionnaire did indeed measure the construct and had appropriate vocabulary. They suggested improving the format in which the questions were written. When analyzing the opinions of the ten parents who participated in this stage, it was concluded that they all approved the questionnaire. They did not suggest any changes to the wording or vocabulary and said that the time allocated to answer the instrument was adequate. The results obtained were considered reliable since the interview was semi-structured, was carried out in a safe environment and respondents did not feel any pressure or interference while expressing their opinions.
After carrying out two pilot studies, the resulting Cronbach's alpha was 0.83%, indicating that the internal consistency of the instrument was good. The final version of the questionnaire is shown in Figure 1.

DISCUSSION.
Patients with cerebral palsy depend greatly on their parents and/or caregivers to perform routine activities, 9 which contributes significantly to the development of oral pathologies. Parents and/or caregivers of children with cerebral palsy play a crucial role in maintaining the oral health of their dependents, which is why it is necessary to assess their knowledge on this matter.
The only available questionnaires to date are those assessing the oral health knowledge of parents and/or caregivers of healthy children. 10, 11 This new instrument was designed with the aim of helping patients with cerebral palsy. Assessing the oral health knowledge of parents may contribute to the development of individualized educational strategies. It has been reported that caregivers of patients with or without special needs, who have received special training on oral health care, have a positive impact on the oral status of these patients. 12 This instrument could also be useful to infer the baseline oral health status of patients with CP before their direct evaluation in a dental unit, since a relationship has been established between the oral health status of children and the level of know-ledge of their parents. 5,6,10 Additionally, this instrument would be a useful tool to collect data that could later be analyzed to develop community education strategies focused on aspects less known to caregivers.
The resulting questionnaire is composed of twenty questions related to aspects of oral health that can be observed in children with cerebral palsy. After identifying these aspects, parents should make the necessary changes to provide more appropriate oral care for these patients.
It has been reported that people with cerebral palsy may have a higher prevalence of oral diseases than the general population. 13,14 Question 10 ( Figure 1) aims to identify if the caregiver has at least a general knowledge of the influence of cerebral palsy on the child's oral health status.
Patients with cerebral palsy cannot perform optimal oral hygiene on their own due to their motor disorders, resulting in the development of oral diseases related to the accumulation of bacterial plaque. 15, 16 In addition, due to swallowing problems, residual food can be found in the oral cavity of these patients. 17 Therefore, it is essential to determine if the caregivers have a basic level of knowledge of periodontal health, assessing if the parents and/or caregivers pay the necessary attention to oral hygiene, not only of teeth, but also of the soft tissues and mucosa that surround them. Questions 1, 3, 4, 6, 7 and 13 assess this particular aspect (Figure 1). Although conflicting results have been published in relation to the prevalence of caries in patients with cerebral palsy, 13,18 it has been demonstrated that these patients face situations that may increase their risk of developing dental caries and that, in addition, they have a greater number of untreated carious lesions. 18 Questions 5, 8, 9, 12 and 17 ( Figure 1) seek to identify whether parents or caregivers recognize the importance of primary teeth and whether they have basic information on the etiology and prevention of dental caries.
Patients with cerebral palsy usually ruminate, resulting in a decrease in pH of the oral cavity to values of 1.5 to 2, which has been associated with an increased risk of developing caries. 14, 19 The aim of questions 19 and 20 ( Figure 1) is to determine if caregivers know that regurgitating food from the stomach can result in dental health problems of patients with cerebral palsy.
Dento-maxillary anomalies can be found in patients with CP.
Questions 16 and 18 ( Figure 1) are aimed at recognizing whether caregivers associate dental malocclusions with an increased risk of caries and periodontal disease, and whether they link bad habits with the appearance of dento-maxillary alterations, 20 such anterior open bite.
A high percentage of patients with CP suffer from dysphagia, which can have serious consequences if not detected or properly managed. 21 It is essential to assess if caregivers know that, even though their child may not be fed by mouth, it is important to maintain adequate oral hygiene to reduce the development of periodontal and bronchopulmonary pathologies (see questions 2, 11 and 14, Figure 1).
Patients with CP have a high prevalence of dentoalveolar trauma, 22,23 and if a patient has labial incompetence, they are at an even higher risk. An adequate labial closure is a protective factor. 24 It is important to determine if parents and/or caregivers of children with CP are aware that labial incompetence makes the patient prone to further damage in case of suffering oral trauma. Knowing how to identify this type of condition will improve the referral time to orofacial motor therapy. Question 15 (Figure 1) is related to this aspect. Among the strengths of this study is the methodology used to find articles that contained relevant information for the development of the proposed questionnaire. The results obtained in the review revealed that it appears there are no validated questionnaires published on this topic. There are only some qualitative studies evaluating the relationship between the quality of life of individuals with a disability and their oral health problems. 25, 26 However, these studies do not assess the oral health knowledge of parents and/or caregivers. Therefore, another strength of this study is that it provides an original instrument to perform such measurement or assessment.
The fact that the reliability of the instrument has not yet been tested is a limitation of the study. This means its use in clinical practice and in research should be done with caution, since the psychometric properties of the present questionnaire have not been evaluated.

CONCLUSION.
Cerebral palsy affects the oral health of patients, so it is necessary to implement procedures to prevent the onset and progression of oral pathologies. A way to prevent oral diseases in people with cerebral palsy is the training of parents and/or caregivers of children with this condition, since it has been observed that adequate oral health knowledge could help improve the oral condition of patients.
By identifying the oral health knowledge of parents and/or caregivers of children with CP, specific educational programs can be developed for them. The designed instrument is effective to evaluate the proposed construct, although it still requires psychometric assessment to identify its reliability to use it in clinical and research studies.