Abstract
The Childhood and Adolescence Surveillance and PreventIon of Adult Non-communicable disease (CASPIAN) study is implemented in the Islamic Republic of Iran from 2003. The aim of this national school- based surveillance program was to provide accurate data of regular surveys of this program to be reviewing methodology, protocols, data collection and questionnaires of these surveys. Information was obtained from articles and books were published from CASPIAN studies. The CASPIAN studies were repeated every two years, with blood sampling for biochemical factors every four years. Methods and questionnaires of all surveys were similar at their core level and some optional factors added in different surveys. The results of CASPIAN studies represent the public health of Iranian children and adolescents that are useful for policy makers and based on them, intervention programs can set in national and sub-national level.
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Introduction
The Global school-based student health survey (GSHS) is a school-based survey performed among adolescents, aged 13–17 years, to obtain accurate information on behavioral risk factors and protective factors. GSHS program can help countries to make and develop policies and school health programs as well as allow countries and international agencies to make comparisons between countries on prevalence of health behaviors and protective factors. Also, gathering data from this program can use to determine trends in prevalence of behavioral risk factors and protective factors by country for evaluation of school health programs [1].
The self-administered questionnaire is used by GSHS program to gather information on behavioral risk factors and protective factors are in relationship with morbidity and mortality among children and youth [2]. The self-administered questionnaire included core questionnaire modules, core-expanded questions and country-specific questions that countries make their unique questionnaire for adolescents using the three components.
The 10 core questionnaire modules included alcohol use, tobacco use, drug use, sexual behaviors, hygiene, dietary behaviors, mental health, physical activity, protective factors, Violence and unintentional injury [1].
In 2001, WHO, in collaboration with UNAIDS, UNESCO, and UNICEF, and with technical assistance from the US Centers for Disease Control and Prevention (CDC), initiated development of the GSHS.
Since 2003, Ministries of Health and Education around the world have been using the GSHS to periodically monitor the prevalence of important health risk behaviors and protective factors among students. To date, several countries have completed a GSHS [3].
Therefore, for the first time in the Islamic Republic of Iran, a project has been initiated to provide a culturally-appropriate model for action-oriented interventions, and to implement a national school-based surveillance system for risk behaviors and risk factors for chronic diseases. The C hildhood and A dolescence S urveillance and P reventI on of A dult N on-communicable Disease (CASPIAN) Study is a joint collaboration of the WHO Regional Office for the Eastern Mediterranean (WHO/EMRO) and the Iranian Ministry of Health and Medical Education and the Ministry of Education [4]. To date, 4 phases of CASPIAN have completed. The surveys were repeated every 2 years, with blood sampling for biochemical factors every 4 years.
The aim of the current paper on this national school- based surveillance program is to provide accurate data of 4 surveys of this program to be reviewing methodology, protocols, data collection and questionnaires of these surveys and preparing a list of lessons learned from these studies for further researches.
Methods and materials
We reviewed the documents and four surveys of this program in terms of methodology, protocols, data collection and questionnaires.
Reference lists of included articles and books were published from CASPIAN studies. The articles were identified through a search of Google scholar and PubMed databases that were published between 2006 and 2013.
Finally, we prepared recommendations and a list of lessons learned from these studies for further researches to design and implement necessary interventions in the next phases of the study.
Conclusion
CASPIAN I
This survey was conducted from 2003–2004 in rural and urban areas of central counties of 23 provinces in the Islamic Republic of Iran [4].
CASPIAN II
This study was in 2007–2008 in rural and urban areas of 28 provinces [5].
CASPIAN III
This study was performed from 2009–2010 in rural and urban areas of the central counties of 27 provinces [6].
CASPIAN IV
This survey was conducted in 2011 and 2012 in rural and urban areas of the central counties of 31 provinces [7].
Study population and sample size
CASPIAN I
The sample size was calculated as 900 students, aged 6–18 years, in each district of the 23 provinces, taking 150 students of each sex and in each of the 3 age groups under study. Therefore, the total sample size was calculated to be 20, 700 in the 23 provinces, which was increased to 22, 000 to allow for a 5% estimated missing data. The students were selected from elementary, middle and high school by multistage, random cluster sampling from different residence (urban/rural) and different types of schools (public/private) to avoid socioeconomic bias [4],[8].
CASPIAN II
The final sample size was calculated as 9,216 students aged 11–18 years in the 28 districts under study, which was increased to 10,200 to allow with an estimated response rate of 85 percent (85 clusters of 120 people, 20 students in each sex and age group). The students were selected by multistage, random cluster sampling from last year of elementary school, middle and high school as well as different residence (urban/rural) [5].
CASPIAN III
The total sample size in the 27 provinces was calculated to be 4,950, which was increased to 6,000 to allow with an estimated response rate of 80 percent. The survey was performed on 5,570 students, aged 10–18 years, who were selected by multistage random cluster sampling (84 clusters of 72 people, 12 students in each sex and age group). The schools were stratified according to location (urban/rural), and different types of schools (public/private) to avoid socioeconomic bias [6].
CASPIAN IV
The final sample size was calculated as 14,880 students aged 6–18 years in the 30 provinces in Iran (48 cluster of 10 people in each province). The sampling method was a multistage cluster sampling. The students were selected from elementary, intermediate and high school by multistage, random cluster sampling from different residence (urban/rural) and different types of schools (public/private) [7].
Instrument and measurement
All methods and questionnaires of CASPIAN studies were similar at their core and some factors add as an optional in different CASPIAN studies. In all CASPIAN surveys, a written informed consent and verbal consent was obtained from the parents and students; respectively, after complete description of the procedure involved.
CASPIAN I
Questionnaire
The questionnaires were prepared based on the WHO Global School Health Survey (GSHS) and the WHO STEPwise approach to non-communicable diseases (Tools, version 9.5) that include core questionnaire modules, core-expanded questions and country specific questions that are composed to form a self-administered questionnaire.
A panel of experts affirmed the validity of the content. Item analysis and reliability measures were assessed based on a pilot study [4],[9].
The questionnaire included the socio-demographic variables, family history of NCD (premature CVD, osteoporosis, obesity and cancer), as well as family dietary habits were contained in the parents’ questionnaire. In addition, students filled a food frequency questionnaire. The students’ self-reported physical activity pattern was assessed using a scaled questionnaire. All the questionnaires were modified and validated in Iranian youth [10],[11].
Dietary and exercise habits were assessed for 21,111 school students (96% participation rate) ,aged 6–18 years, living in urban and rural areas.
In the 20 provinces which agreed to include a smoking questionnaire, the smoking habits (active/passive) were assessed with an anonymous questionnaire among 11,966 middle- and high school students [4].
Physical and laboratory measurements
All instruments were standardized before the examination, and the balance were zero-calibrated. In schools, trained nurses recorded dates of birth, and measured height and weight twice. Waist circumference (WC) and hip circumference (HiC) was measured as well as the blood pressure (BP) according to a standard protocol. Physical measures made for 21,111 school students (96% participation rate), aged 6–18 years, living in urban and rural areas.
For blood sampling, students were invited to attend the nearest health center to the school, accompanied by a parent. Fasting blood sugar (FBS), high-density lipoprotein cholesterol (HDL-C) and triglycerides (TG) and low-density lipoprotein-cholesterol (LDL-C) were measured. Lab measurements were performed in a subsample of 4,811 students aged 6–18 years in 6 provinces with a population of different ethnicities [4]. 1,000 subsamples of blood were stored for later lab measurements.
CASPIAN II
Questionnaire
The questionnaires were prepared in Farsi based on Global School Health Survey (GSHS) and Youth Risk Behavior Surveillance (YRBS). The face validity was affirmed based on a pilot study. GSHS questionnaire was used for 3 age group but YRBS questionnaire used for middle- and high-school students.
The questionnaire included questions about socio-demographic characters, family history of NCD, as well as questions about the relationship with peers, psychosocial status of school, physical activity pattern, hygiene, violence and unintentional injury, protective factors, mental health, tobacco use and sexual behaviors.
Under the supervision of expert health care professionals, the students filled out the self-administered questionnaire. The questionnaires were filled with 9,171 school students [5].
Physical measurements
In this study height and weight only was measured [5].
CASPIAN III
Questionnaire
The questionnaires were used in Farsi based on and the WHO global school-based student health survey, and added some more questions to the questionnaires of parents. The validity of their content was affirmed based on observations of an experts’ panel and item analysis. Reliability measures were assessed based on a pilot study (methodology).
The questionnaire of this study was similar to the CASPIAN II study. Similar other CASPIAN studies, under the supervision of expert health care professionals, the students filled out the self-administered questionnaire and the parent of student filled the questionnaire at home. 5,570 school students were assessed ( 95.6% participation rate) [6].
Physical and lab measurements
In the third survey of CASPIAN study, similar to CASPIAN I, anthropometric index, blood pressure and blood sampling (FBS and lipid profile) was measured, in addition liver enzymes such as Serum Glutamic OxaloaceticTransaminase(SGOT) and Serum Glutamic Pyruvate Transaminase (SGPT) was measured for liver function test.
Blood pressure and blood sampling were measured in a subsample of 5,408 and 4,790 students, respectively [6]. 4,000 subsamples of blood were stored for later lab measurements.
CASPIAN IV
Questionnaire
The Questionnaire of students was similar the CASPIAN II and III. The questionnaire of parents had 7 sections included the results of inquiry, demographic variables, history of the student, family history, diet and unintentional injury of the student (90.6% participation rate) [7].
Physical measurements
In this study similar to CASPIAN III, height, weight, waist circumference, hip circumference and blood pressure were measured. In addition, the wrist circumference was measured [7].
Quality control
CASPIAN I
Data for all forms and questionnaires were entered twice and checked for completeness and inconsistencies. The supervisor of the data entry and analysis team quantified questionnaire data, including observations, interviewing, physical and laboratory measurements, and entered them into a computerized database (Microsoft Access XP). Data checking process was performed first at the district level by local supervisors to minimize missing and doubtful data, then at the national level by a group of statisticians. The quality of the data collected was monitored by the Data and Safety Monitoring Board (DSMB) of the project in order to identify and document problems in data quality [4]. The individual data and aggregated is available.
CASPIAN II
For entering data, the questionnaires were gathered in the department of Health, Tehran University of medical sciences. Data were entered into a computerized database (Microsoft Excel XP).
Due to the large project and resource constraints, data were not entered twice. For quality control of data, we used two methods, the frequency of all data had taken and regarding to their limits all pert data had revised and had corrected. The 5 controlling question had chosen and if someone had been responding incorrectly to 3 questions from 5, his all data element [5]. The individual data is unavailable and aggregated is available.
CASPIAN III
Data for all forms and questionnaires were gathered in the office of school health, ministry of health and medical education and entered into a computerized database.
Data checking was conducted first at the district level by local supervisors to minimize missing and doubtful data, then at the national level by a group of statisticians. They evaluated the databank fields for outliers and rechecked a sample of entering questionnaires for each operator [6]. The individual data and aggregated is available.
CASPIAN IV
Data checking was conducted first at the district level by academic supervisors (Expert of school health). Then the data were controlled by national supervisors and operator [7].
The individual data and aggregated is available.
Funding
Grant TSA03/11 World Health Organization/Eastern Mediterranean region and the Iranian Ministry of Health and the Ministry of Education funded the CASPIAN I study [12]. CASPIAN II, III and IV studies were funded by Iranian Ministry of Health.
Table 1 shows the summary of CASPIAN studies comparison.
Future perspective
The CASPIAN studies have been provided data about public health of Iranian children and adolescent and represented health status in country; as a result it is so serious to repeat this study in the future. It is better that CASPIAN study will be done in a large number of participants in provinces of Iran, and the intervention will be designed based on the data of each province.
Lessons learned
In the CASPIAN I study, the impact of after-school physical activity program on health-related fitness of mother/daughter pairs was investigated. The multicenter was performed from 2006–2007 in 7 provinces in Iran. Girl students (7th-10th grade) and their mothers were selected by random cluster sampling. After school aerobic physical activity were held in 24 sessions, twice per week, during 90 minutes for 3 months. At the beginning and at the end of the study, physical activity, body weight, waist (WC) and hip circumference, body mass index (BMI), resting heart rate, cardio-respiratory fitness, flexibility and muscle strength were measured. After the intervention, mean of weight, BMI, WC and waist to hip ratio (WHR) decreased significantly among girls and their mothers [13]. Resting heart rate decreased significantly in both of them. Upper body and abdominal muscular strength and flexibility increased significantly at the end of study among students and their mothers [14]. The success of this trial might e a result of contribution of the student’s mothers in the physical activity program.
Knowledge dissemination
One book and 20 articles were published from CASPIAN I study. One book was published from CASPIAN II study and from CASPIAN III, one book and 25 articles was available. The book of CASPIAN IV is under preparation and 8 articles were published.
Recommendation
Quality control is codified for a study that included quality validation, trending, sampling, data management, data reporting, analysis and doing interventions.
These surveys reinforce the need to establish and reinforce intervention programs which are not only school- based but would involve the family structures, community prevention programs and government agencies to help preventing risky behaviors.
Instruments and methodology of these studies become more consistent with WHO Global School Health Survey. As a result, the results of these studies become comparable with the results of other countries.
Summary
According to necessity of having information related to behaviors process and health risk factors related to students’ health, the CASPIAN study conducted at 2003–2004 and performed every 2 years. Until now, 4 phases of CASPIAN study was performed at I.R Iran. All methods and questionnaires of CASPIAN studies are similar at their core level and some factors add as an optional in different CASPIAN studies. The results of CASPIAN studies are useful for policy makers and based on them, intervention programs for improving students’ health will be planed.
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Acknowledgements
We would like to thank all the persons and organizations that contributed to doing the Global School Health Survey in Iran (CASPIAN), as well as to the students who participated in the study.
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ZA, GSH, and MQ wrote the first draft of manuscript and managed the literature searches. SS and SMA edited the manuscript. BL, RH and RK participated in study design and supervised the work. All authors read and approved the final manuscript.
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Ahadi, Z., Shafiee, G., Qorbani, M. et al. An overview on the successes, challenges and future perspective of a national school-based surveillance program: the CASPIAN study. J Diabetes Metab Disord 13, 120 (2014). https://doi.org/10.1186/s40200-014-0120-3
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DOI: https://doi.org/10.1186/s40200-014-0120-3