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Journal of Stomatology
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2/2021
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Original paper

Comparative analysis of oral health outcomes for five-year-old children (SOHO-5) scale and early childhood oral health impact scale (ECOHIS) in Chilean’s preschoolers

Valeria Campos
1
,
Carla Bastías
2
,
Marcos Orellana
2
,
Karen Sáez
2
,
Ricardo A. Cartes-Velásquez
3

1.
School of Health Sciences, Universidad Autónoma de Chile, Chile
2.
School of Dentistry, Universidad Bolivariana, Chile
3.
Department of Public Health, Fundación Kimntrum, Chile
J Stoma 2021; 74, 2: 110-115
Online publish date: 2021/06/14
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- JoS-00300-Campos.pdf  [0.60 MB]
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Introduction

Different standardized instruments have been deve­loped and validated to measure oral health-related quality of life (OHRQoL) [1-5]. OHRQoL is obtained from the analysis of responses of the individuals that contemplates different dimensions. Most of these instruments applied are designed according to psychometric model, which is based on the ability of a subject to discern between stimuli of different intensity. For this, target questions are generated that point to a specific stimulus, where the person then will respond through a scale of values, which will be subsequently ordered and analyzed [6-9]. Generally, OHRQoL instruments are specifically age-related, as oral health is strongly age-dependent [10]. Therefore, the development of instruments to assess the impact of oral health on children’s quality of life has been developed or adapted to this specific group [3, 5, 10-12]. Among these, early childhood oral health impact scale (ECOHIS) has been developed to be administered to parents and caregivers of preschool children. This scale has been authorized in different countries and languages [3, 13-17] and has proven to provide valid and reliable information on the OHRQoL of preschool children [18]. Scale of oral health outcomes for five-year-old children (SOHO-5) was developed based on evidence that children aged four to six years can reliably report quality of life on their own, where the preschool and the parent or caregiver answer the questions [5]. This scale has been also validated in different languages [19-23]. Even though both scales have been widely used, Barbosa et al. concluded that there is a positive correlation between ECOHIS, SOHO-5 parents, and caries; how­ever, SOHO-5 children did not correlate to any of the variables included [24]. Currently, ECOHIS and SOHO-5 has been authenticated for Chilean population, although there is no clarity which of the scale has a better performance and discriminant validity for caries.

Objectives

Therefore, the aim of this study was to compare the SOHO-5 (parental version and child’s self-reports) and the ECOHIS in a sample of Chilean preschoolers.

Material and methods

Study design and participants

This was a cross-sectional study, including 148 preschool children and their parents or caregivers from the Pablo Neruda E-776 School in Curanilahue, pro­vince of Arauco, Chile. Illiterate parents, children with intellectual disability, uncooperative, or institutionali­zed were excluded.

Sample size calculation

The sample size was estimated for correlation between two quantitative variables considering a bilateral α of 0.05, β of 0.10, and a correlation of 0.3, as suggested by Barbosa et al. [24], providing in total 113 dyads.

Variables

The following groups of variables were considered from the preschooler:
• socio-demographic: sex (male/female), school grade (pre- kinder or kinder); all data were obtained from parents’ report;
• oral health: history of caries of permanent (decayed, missing, and filled tooth [DMFT] index) and primary teeth (decayed, missing, and filled tooth [dmft]) were documented according to the 5th edition of WHO guidelines [2]; severe caries was considered for three or more active decays;
• oral health-related quality of life (OHRQoL): it was measured using the SOHO-5 validated in Chilean popu­lation [23], which was answered by caregivers/ parents (parental version) and their child (child’s version), and the ECOHIS was answered by caregivers/parents [17].

Oral health-related quality of life instruments

SOHO-5: this instrument included child (SOHO-5c) and parent (SOHO-5p) version, both with seven items. The child version addresses difficulty eating, drinking, speaking, playing, sleeping, and smiling due to dental problems. Three response options were provided (no  =  0, a little  =  1, a lot  =  2) with the aid of a face scale. For the parent version, five response options were provided (not at all  =  0, a little  =  1, moderate  =  2, a lot  =  3, a great deal  =  4); a “don’t know” option was included, which was not scored. The total score ranged from 0 to 14 in the child version (SOHO-5c) and from 0 to 28 in the parent version (SOHO-5p). ECOHIS: this scale, which was answered by a parent, had 13 items distributed between the child impact (9 items) and family impact sections (4 items). The scores were calculated based on a five-point Likert scale, with response options ranging from “never” (0 points) to “very often” (4 points), and a “don’t know” answer was included, which was not scored. The child impact section scores ranged from 0 to 36, and the family impact section from 0 to 16, with a total score ranging from 0 to 50 [23]. The total score of both instruments were calculated by the sum of codes for each item, where higher scores denoting a greater negative impact on quality of life.

Data collection

Collection of clinical and socio-demographic data, and the application of instruments were performed in the facilities of the school. A single-trained examiner interviewed each child individually, without the presence of caregivers or other children to prevent their influence on the answers. Another single-trained examiner performed all clinical examinations, with a help of assistant. All equipment was previously sterilized. During the exam, the child laid on a school table. The SOHO-5p and ECOHIS were self-administered to the parents/ caregivers during a parent-teacher meeting arranged for the purpose of this study.

Ethics

This study was approved by the Research and Bioethics Committee of the Universidad Bolivariana (No. 001/2020), and was conducted in full accordance with the World Medical Association Declaration of Helsinki. All the parents/caregivers agreed to participate by signing an informed consent. The survey was anonymous, and the information was used only for the purposes of this research.

Statistical analysis

Data were tabulated in an Excel spreadsheet (Micro­soft Corp., USA). The analysis of data was made using STATA 12/SE (StataCorp, TX, USA). Descriptive statistics for distribution, mean, and standard deviation were made. Non-normal distribution was analyzed using Shapiro-Wilk test (p < 0.001); thus, non-parametric tests were used. Spearman’s correlation coefficient was used to test the association between ECOHIS and SOHO-5 scores, as its dimensions, dmft index, and its components. Mann-Whitney U test was applied to assess statistically significant differences in ECOHIS and SOHO-5 scores between the children with and without severe caries. Cohen’s d and r were calculated for effect size determination. Based on Cohen’s criteria, an effect size  <  0.2 was a small, 0.2 to 0.7 was a moderate, and  >  0.7 was considered a large difference. For all cases, statistical significance was set at p < 0.05.

Results

The sample consisted of 121 dyads, characterized in Table 1. Correlations between the SOHO-5 and ECOHIS, and their dimensions, are shown in Table 2. A significant correlation was found between ECOHIS and teeth with caries (r = 0.2732; p = 0.0024), filled teeth (r = 0.2015; p = 0.0267), overall dmft (r = 0.3758; p < 0.001), and between the SOHO-5 parent and overall dmft (r 0.1808; p = 0.0472). Differences in the ECOHIS and SOHO-5 scores between children with and without severe caries are shown in Table 3.

Discussion

In the present study, it was found that the SOHO-5p and ECOHIS were strongly correlated. Moreover, the SOHO-5p and ECOHIS were able to discriminate between preschoolers with and without severe caries. In contrast, the SOHO-5c was not correlated with the SOHO-5p, nor ECOHIS. In addition, the SOHO-5c did not discriminate between the presence and absence of severe caries among the sample. We evaluated these two instruments’ discriminative validity, as they are the only ones that have been validated in Chilean Spanish preschoolers [17, 23]. It is important to highlight that the Chilean versions of SOHO-5c as the SOHO-5p and the Chilean version of ECOHIS reported a high Cronbach’s a. Regarding the inability of the SOHO-5c to discriminate between preschoolers with and without severe caries, there are several issues. One reason may be due to the age of participants; in Chile, preschoolers generally range from 4 to 5 years old. It has been observed that only an initial understanding of time concept at the age of 5 is achieved, and these children experience difficulties understanding health concepts, which could affect the recall of past events [26]. Another reason could be their social context, as more than 50% of the Pablo Neruda School preschooler caregivers did not accessed higher education, and in some cases, they only completed elementary school. It has been well-described that social background play a major role in the comprehension [27].
To our knowledge, this is the second investigation that studied the discriminate validity of the SOHO-5 and ECOHIS, and similar results were obtained [24]. However, further research should include a wider popu­lation of preschoolers from different socio-economic backgrounds in order to determine the discriminative properties of the SOHO-5c. In addition, Zaror et al. suggested that the SOHO-5 would need more research in its reliability and interpretability [18]. The latter may be because previous studies did not analyze the SOHO-5c and SOHO-5p separately, whereas the SOHO-5c may underscore its global reliability. The ECOHIS was the instrument with the strongest discriminative validity; it did not include preschoolers’ participation, was user-friendly, with only 13 items. Moreover, the ECOHIS presented higher values regarding EMPRO (evaluating the measurement of patient‐ reported outcomes) tool in overall score, conceptual and measurement model, reliability, validity, and interpretability among OHRQoL instruments for preschoolers [18].
These features may be of relevance while choosing a tool for future OHRQoL research. These significant results were based on statistics, which did not always assure a clinical relevance criterion. In fact, effect sizes for the ECOHIS/SOHO-5 and caries were small to moderate, but there was no large difference. Moreover, only total score for the ECOHIS showed a noticeable difference between the children with and without severe caries, but this was lesser than 3 points. Among the limitations of the study is that we used dmft index instead of ICDAS, which does not measure the extension or severity of the lesion itself. Therefore, a patient classified as severe caries may have had 4 carries but with a scarce compromise, or a patient classified as no severe caries but with 2 active caries with a large compromise of the teeth involved. Another limitation is that the sample corresponded to a public school and most parents had a low household income; these two aspects were related with lower neuro-psychological maturity [27].
Among the application of this research in Chile is that the ECOHIS could be used by nursery teachers in caregivers to identify preschoolers that need dental care for prompting timely dental treatment. Although its acceptability by non-dental professionals has not been evaluated yet.

Conclusions

The ECOHIS and SOHO-5p were both significantly correlated with OHRQoL among preschoolers. Nevertheless, the SOHO-5c did not correlate with any of the variables studied, nor with the SOHO-p or ECOHIS. The ECOHIS showed a greater discrimination with the oral health status of preschoolers, as measured by the presence of severe caries.

CONFLICT OF INTEREST

The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

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