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Prevalence of musculoskeletal disorders among school teachers from urban and rural areas in Chuquisaca, Bolivia: a cross-sectional study



Musculoskeletal disorders (MSD) are important health problems in working populations. The study aimed to determine the prevalence of MSD among school teachers from urban and rural areas in Chuquisaca, Bolivia.


A cross-sectional study was conducted in 60 randomly selected schools. In total, 1062 teachers were invited to participate (response 58%). The Spanish version of the Standardized Nordic questionnaire was used assessing the 12-months and 7-days prevalence of MSD as well as the 12-months prevalence of work limiting pain. Prevalence were calculated for the different parts of the body; as summary measures, MSD in any part of the body and in ≥3 parts of the body were assessed. Crude and adjusted odds ratios with 95% confidence intervals were calculated using logistic regression models adjusting for age, sex, teaching level and school type.


Prevalence of MSD in any part of the body was 86% during the last 12 months, 63% during the last 7 days and 15% for work limiting pain. MSD was most common in the neck (12-months prevalence 47%) and least common in the wrist/hands (26%). In the adjusted model, teachers working in rural areas presented significantly higher odds than teachers from urban schools for work-limiting pain during the last 12-months considering any part of the body (aOR 2.2; 95% CI 1.1–4.1), and for ≥3 parts of the body (aOR 3.7; 95% CI 1.3–10.6).


The prevalence of MSD is high in School teachers, even more in teachers working in rural areas. It is needed to identify risk factors for MSD in teachers in order to propose appropriate strategies to control and reduce it.

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Musculoskeletal disorders (MSD) have been reported as one of the most common and important health problems in working populations, generating social and economic implications [1]. In teachers, prevalence of MSD was found to range between 39% and 95% [2]. In general, they reported more frequently back, neck and upper limbs problems although there have been marked differences between the type of teacher and the body part affected.

Teachers working conditions in rural schools face greater challenges than in urban areas, such as social and geographic isolation, poor working conditions, poor remuneration, limited opportunities for professional improvement, lack of adequate resources, careless buildings, cultural differences and poor community involvement [3, 4]. Additionally educational system in many countries has no adequate strategies to attract and retain competent and qualified teachers [5], impacting on working conditions with greater limitations in rural schools.

Some studies reported that physical factors such as prolonged standing, sitting and uncomfortable posture are known to be associated with increased prevalence of MSD [6]. In addition, several studies suggest that psychosocial factors including high workload and demands, high perceived stress levels, low social support, low job control, low job satisfaction and monotonous work are associated with MSD among school teachers [7]. In this sense, it is possible that teachers in rural areas may be more exposed to develop musculoskeletal disorders.

In Bolivia, teachers and administrative staff working in the educational sector represent the largest public workforce (around 100,000 workers) [8]. According to the World Bank, expenditure of the Bolivian Government on education increased from 5.7% in 1999, to 6.4 in 2012 [9]. Chuquisaca, one of the nine departments (regions) in Bolivia, is located in the south part of the country. It has an estimated population of 616,073 inhabitants from which 50.2% are living in rural areas [10]. Illiteracy rate in Chuquisaca is around 8 to 37%, school attendance between 69 to 89% and coverage for primary education 86.2%, lower than the national coverage (92%) [11]. As in other Latin American countries, educational indicators in Bolivia and in Chuquisaca show big differences between urban and rural areas with lower educational levels and more unfavorable working conditions in rural areas [11,12,13].

Working and health conditions in Latin-American and especially in Bolivian teachers have been scarcely explored. In the same way, there are few reports exploring health conditions in teachers working in rural areas. Therefore the objectives in our study were to determine the prevalence of musculoskeletal disorders considering the whole body and to compare differences between schools teachers working in rural and urban areas of Chuquisaca, Bolivia.


A cross-sectional study was conducted in Chuquisaca, Bolivia from August to November 2015.


The Bolivian educational system is organized in alternative education (adult, permanent and special education) and regular education which includes preschool, primary, secondary and higher education in public, private and semi-public schools (Public using private infrastructure). Teachers working in regular education in Chuquisaca region were the target group for this study comprising a total of 8954 teachers working in 1284 schools (Regional Education Direction Register 2014), 57% of them in rural areas.

In order to sample the teachers, a simple one-stage cluster sampling was performed including all 626 geographically accessible schools with at least 5 teachers. These schools employed about 86% of all teachers in Chuquisaca. Of these, we randomly selected 27 schools located in urban areas and 33 located in rural areas as primary sampling unit and invited all teachers working in those schools (1062) to participate in the questionnaire study.

Sample size was calculated using StatCalc-EpiInfo. An estimated prevalence for 12-months MSD of 50% was considered. In order to reach a statistical power of 80% to detect differences of 5% in the prevalence of MSD between urban and rural areas, 240 teachers in both urban and rural areas were needed.


Validated questions to explore sociodemographic variables and working conditions at school were used from the VI National Survey of Working Conditions and Health (Spain) [14] and from the Working Conditions and Health Teaching Study published by the Regional Office of Education of UNESCO for Latin America and the Caribbean, OREALC/UNESCO respectively [15]. For the assessment of musculoskeletal disorders the Spanish version of the Standardized Nordic questionnaire was used [16]. It explores the 12-months, 7-days prevalence of musculoskeletal disorders or discomfort in neck, wrist or hands, shoulders, upper and low back, hips or thighs, knees and ankles or feet as well as the 12-months prevalence of work limiting pain in the same body areas. This questionnaire has been reported to be a reliable and valid screening and surveillance tool for musculoskeletal disorders (MSD) [17]. An English version of the questionnaire is available in Additional file 1.

Sociodemographic information included: age (categorized into 4 groups: < 30 years, 30–39, 40–49 and ≥ 50 years), gender (male and female), and school location (rural and urban). Teaching level was grouped in exclusive primary teachers, exclusive secondary teachers and teachers working at primary and secondary level. Type of school was categorized in Public and Private (including public school with private infrastructure) considering the type of school administration where the teacher was working most hours.

To define the outcome, the following definitions were used:

  • 12-months musculoskeletal disorder (MSD): was considered present if self-reported ache, pain or discomfort in neck, wrist or hands, shoulders, upper and low back, hips or thighs, knees and ankles or feet during the last 12 months was reported (Separately for each part of the body)

  • 7-days MSD: was defined as 7-days prevalence of MSD.

  • 12-months work limiting pain was defined as work impediment in the last 12 months prior to survey because of MSD.

Any MSD was considered when the teacher reported 12-months MSD in any part of the body (neck, wrist or hands, shoulders, upper and low back, hips or thighs, knees and ankles or feet) respectively. If no disorder was present in the last 12-months than also no disorder can be present in the last 7 days nor can the pain be work-limiting. The choice of the time frames was determined based in previous studies in order to explore past pain (during the last 12 months) and also current but chronic or recurrent pain (disorder reported during the last 12 months and during the last 7 days) [16, 18].

The number of the parts of the body affected was computed adding up the number of places that were reported with discomfort. The range was between 0 (no body parts affected) to 8 (all body parts affected). The median value of this sum was used as cut off (≥ 3).


The selected schools were contacted to explain the research objectives and coordinate visits. For every teacher, every school received an envelope with the questionnaire, information sheet and informed consent form. Two boxes were set up in each school, the first one to deposit the full questionnaire (in a sealed envelope), and the second one to deposit the signed informed consent form. The ID number on the questionnaire was not written on the informed consent form in order to ensure anonymity of the study. Teachers were told to note down their personal ID so that they could withdraw participation at any time.

Data analysis

As quality control a double-entry of data and congruence checking was performed EpiInfo v. 7 for Windows. Data was exported to SPSS v.17 for further analysis.

In order to check for the potential dependence of samples due to the cluster sampling, intraclass correlation coefficients (ICC) were computed to analyze the correlation of responses within the clusters (schools) for each of the outcomes [19]. ICC was less than 0.001 for all definitions of MSD. For that reason the analyses were not adjusted for cluster sampling.

The number of cases and period prevalence of the MSD outcomes were calculated for a general description of the study population comparing the distribution in rural and urban areas. In addition, crude (OR) and adjusted odds ratios (aOR) as well as their corresponding 95% confidence intervals (95%CI) were calculated using bivariate and multivariate logistic regression models. The models were adjusted for sociodemographic and working conditions variables which were statistically significant associated with exposure and outcome (p value ≤0.05) in the bivariate analysis (Table 1).

Table 1 Description of the study population (N = 517)


A total of 620 teachers returned the complete questionnaire reaching response of 58% (57% in urban and 59% in rural schools). For analysis, 103 questionnaires were excluded because participants were administrative staff (N = 19) or did only complete the questionnaire partially (N = 84). There were no statistically significant differences in descriptive variables between included and excluded teachers.

In rural areas compared to urban areas, teachers were statistically significantly younger, more likely to be male, to work at the secondary level and to work at a public school (Table 1).

The period prevalence of MSD in any region was 86%, 63% and 15% for the last 12-months, 7-days and 12-months prevalence of work limiting pain respectively and 48%, 26% and 5% for musculoskeletal disorders in three or more parts of the body (Table 2). In general, rural area showed a higher prevalence of MSD although the difference was not statistically significant for all outcome definitions.

Table 2 Prevalence of musculoskeletal disorders (MSD) in school teachers from urban and rural areas in Chuquisaca, Bolivia (N = 517)

The 12-months prevalence of musculoskeletal disorders ranged from 26% for wrist/hands to 47% for neck. Only for neck and knee disorders the prevalence was higher in urban areas. Following the same pattern, 7-day prevalence ranged from 14% for disorders in wrist/hands to 31% for neck disorders. For work limiting pain during last 12-months it ranged from 3% for wrist/hands to 6% for neck (Table 2).

The adjusted logistic regression models basically confirmed the bivariate analyses: teachers working in rural areas reported statistically significantly higher odds than teachers from urban schools for any work limiting musculoskeletal pain during the last 12-months prior to survey (aOR 2.2; 95% CI 1.1–4.1) and for work limiting pain in at least 3 parts of the body (aOR 3.7; 95% CI 1.3–10.6) (Table 3). For specific parts of the body, work-limiting pain in ankles or feet was higher in rural than in urban teachers (aOR 4.4; 95% CI 1.4–13.7). No statistically significant differences were seen for the 12-months nor the 7-days prevalence of symptoms regardless of body part in these adjusted models.

Table 3 Unadjusted and adjusted odds ratios comparing the prevalence of musculoskeletal disorders (MSD) in Bolivian school teachers from urban and rural areas (N = 517)


This study aimed to explore self-reported musculoskeletal disorders (MSD) considering 12-months and 7-days prevalence as well as the 12-months prevalence of work limiting pain comparing teachers from urban and rural schools. Prevalence of MSD was high and especially work-limiting pain was more common in teachers employed at rural than in those working in urban schools.

Our results showed considerable prevalence of MSD affecting several parts of the body maybe due to the variety of activities that teachers perform each day at work. Almost half of the participants reported MSD in ≥ 3 parts of the body during the last 12-months and 26% during the last 7-days. It is relatively high if we compare with Brazilian teachers, where 7-days prevalence (≥ 3 parts of the body) was 15.9% in 2011 [20]. This could be explained due to differences in geographic context. Brazilian study comprised metropolitan area with high Municipal Human Development Index (0.717) than the region studied in Bolivia (0.563) [21], and probably working and living conditions are different.

In agreement with previous studies, we found considerable prevalence of disorders reported in the neck and upper extremities but also in back and lower extremities [2]. Although the main focus of the present study is to compare the prevalence of musculoskeletal disorder in urban and rural areas, a major limitation of the study is the lack of inclusion of risk factors that explain these differences. Individual factors, as well as working conditions under which the teachers perform their work could explain the presence of specific musculoskeletal disorders for each region of the body. MSD in neck and upper extremities can be a consequence of the significant use of uncomfortable physical activities, like ‘head down’ posture, during reading, writing on a blackboard or marking of assignments for several hours [22, 23]; but also back and lower extremities could be affected due to long hours standing while teaching [24], postural overloads in the classroom, uncomfortable back support while seated, recurrent twisting, and prolonged static postures [25]. Additionally teachers face every day social and psychological demands inside and outside the school [26, 27], and have reported less time for rest after work, because of extra work at home [28], which could lead in chronic and disabling musculoskeletal disorders [29]. Little information is available about work limiting pain prevalence in teachers. Our results reported a prevalence around 15% for any musculoskeletal disorder, lower than previously reported. One study in Brazilian public school teachers found a prevalence of work-limiting pain in any part of the body of 47.4% [30], also Converso et al. reported a prevalence of 42.9% suffering moderate to severe limiting musculoskeletal pain in nursery school and kindergarten teachers in Italy [31]; In the same way staff at special schools in Germany reported a prevalence of chronic back pain of 27.6% [32]. This difference could be explained, because those studies explored MSD mainly in teachers from special schools, where physical demands as frequently carrying and lifting heavy loads must be taken into consideration.

This is the first study comparing working and health conditions in teachers working in urban and rural areas in Bolivia. Our study showed higher MSD prevalence in rural areas, especially for work-limiting pain independently to age, sex, teaching level and school type. Living and working conditions in rural areas of Bolivia, represents a great challenge for professionals, especially because limited geographic access, bad road conditions, distancing from the family and poor social support between peers, limited access to technology (including internet), language and cultural issues and poor academic support of parents [4]. Additionally the perceived role of the teacher in the rural areas implies a closer work with the community which could demand more physical and psychological demands in the daily work [33]. This situation often leads to the concentration of professionals in urban areas impacting on the quality of education and increasing inequalities between these two areas [34].

Most of the studies explored musculoskeletal disorders through self-reported questionnaires. Although this could have its limitations, Nordic Questionnaire has shown to be a good screening tool, especially in occupational settings. A study found a sensitivity of 100% and specificity of 88% to detect subjects with chronic or recurring low back pain for this questionnaire [17]. Additionally information about pain or discomfort during the last seven days could provide more reliable information minimizing memory recall bias. In this sense we may assume that this situation is not different in our study because teachers were able to understand these questions through their level of education, and fill it in a reliable way due to the anonymous report in the study.

Even though our study had 58% of response, it is within the expected percentage considering studies which focused in musculoskeletal disorders in schools teachers [2]. Nevertheless it is possible that teachers who did not want to participate in the study were those with greater workload and possibly those who may have presented less muscular disorders. Due to feasible reasons, we had to exclude schools with very difficult geographic access or with very few students, mainly located in the rural area (less than 15% from the total). Working conditions and in particular psychosocial factors at work could be a challenge for teachers working in those schools because perception of social, cultural, and professional isolation reported in teacher working in rural areas [35]. For that reason it is possible that the differences between rural and urban areas could be underestimated in our study.


Although prevalence of musculoskeletal disorders is considerable in school teachers in Chuquisaca, it is within the range reported previously. Teachers working in rural areas reported higher prevalence and more severe symptoms than teachers working in urban areas. It is needed to explore in-depth risk factors related to musculoskeletal disorders in this occupational group in order to propose appropriate strategies to control and reduce it. In the same way, it is important to consider surveillance systems in working conditions which include musculoskeletal disorders in teachers.



95% Confidence intervals


Adjusted odds ratio


Intraclass correlation coefficients


Musculoskeletal disorders


Odds ratio


Regional Bureau of Education for Latin America and the Caribbean


United Nations Educational, Scientific and Cultural Organization


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The authors would like to express special gratitude to all the study participants for their cooperation and to the Center for International Health of the University Hospital Munich (LMU) for the financial support.


This study was supported by the Network Funds 2015 through the Center for International Health of the University Hospital Munich (LMU) within the Higher Education Excellence in Development Cooperation (Exceed) program of the German Academic Exchange Service (DAAD) and the Federal Ministry for Economic Cooperation and Development (BMZ) – Germany.

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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.

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MTSS participated in the design of the study, data collection, performed the statistical analysis and wrote the paper. AS and ASS participated in data collection. KR and MP conceived of the study, and participated in its design and coordination and helped to draft the manuscript. All authors revised the manuscript critically for important intellectual content, and approved the final manuscript.

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Correspondence to María Teresa Solis-Soto.

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The study was approved by the Research Ethics Committee of the medical faculty of San Simón University at Cochabamba–Bolivia. In addition, a permission to apply the questionnaire was obtained from the Regional Education Direction in Chuquisaca and the authorities of each selected school agreed on the study. International Ethical standards and procedures for research with human beings were followed to protect the dignity, rights and welfare of research participants [36]. An informative letter, as well as a written informed consent form was provided together with the questionnaire. Voluntary participation was respected.

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Additional file

Additional file 1:

Work and health Conditions in Latin America – School teachers Questionnaire. It includes basic pack of questions to assess Musculoskeletal disorders (Nordic Questionnaire) and sociodemographic variables and working conditions at school. (DOCX 651 kb)

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Solis-Soto, M.T., Schön, A., Solis-Soto, A. et al. Prevalence of musculoskeletal disorders among school teachers from urban and rural areas in Chuquisaca, Bolivia: a cross-sectional study. BMC Musculoskelet Disord 18, 425 (2017).

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