There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Through this international report on the results of its most recent survey, the Health Behaviour in School-aged Children (HBSC) study supplies the up-to-date information needed by policy-makers at various levels of government, nongovernmental organizations, and professionals in sectors such as health, education, social services, justice and recreation
The latest addition to a series of HBSC reports on young people’s health, this report presents findings from the 2009/2010 survey on the demographic and social influences on the health of young people (aged 11, 13 and 15 years) in 43 countries and regions in the WHO European Region and North America Responding to the survey, the young people described their social context (relations with family, peers and school), physical health and satisfaction with life, health behaviours (patterns of eating, tooth brushing and physical activity) and risk behaviours (use of tobacco, alcohol and cannabis, sexual behaviour, fighting and bullying) Statistical analyses were carried out to identify meaningful differences in the prevalence of health and social indicators by gender, age group and levels of family affluence
The aim was to provide a rigorous, systematic statistical base for describing cross-national patterns, in terms of the magnitude and direction of differences between subgroups, thus contributing to a better understanding of the social determinants of health and well-being among young people, and providing the means to help protect and promote their health

Social determinants of health and well-being among young people: Health Behaviour in School-aged Children (HBSC) study: international report from the 2009/2010 survey.

A central construct within the positive psychology literature is life satisfaction. Whereas adult life satisfaction has been studied extensively, the life satisfaction of children and adolescents has only received attention more recently. This article provides a review of the extant research on youth life satisfaction. Empirical studies (n = 141) on life satisfaction among youth are reviewed. The review details how life satisfaction among youth relates to various other important emotional, social, and behavioural constructs. Evidenced by the review are the conditions that foster positive life satisfaction and the implications of positive life satisfaction among youth. Future directions in life satisfaction research among youth are briefly discussed.

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Youth Life Satisfaction: A Review of the Literature

1. The interpretation of epidemiological data of periodontal disease is difficult, due to inconsistencies in the methodology used. It is not possible, therefore, to accurately assess if the prevalence of the periodontal diseases shows a world-wide decline. As long as the disease is assessed through accumulated clinical attachment loss, retention of the natural dentition in older ages entails increased prevalence in these cohorts. Contemporary epidemiological studies should ideally employ full-mouth examination of the periodontal tissues. Partial recording estimates are generally biased, especially when the prevalence of the disease is low. 2. Early-onset periodontitis is infrequent in all populations. Adult periodontitis is rather prevalent; however, advanced disease affects limited subfractions of the population (probably less than 10 to 15%). Although prevalence figures vary with race and geographic region, in most cases, the progression pattern of the disease seems compatible with the retention of a functional dentition throughout life. 3. Of a plethora of behavioral and environmental risk markers identified by multi-variate analysis, smoking and presence of certain subgingival microorganisms have been proven to be true risk factors. The same holds true for diabetes mellitus, a systemic condition that confers a risk for periodontal disease which is independent of the effect of other significant factors. 4. In certain cases, periodontal infections appear to have a systemic impact on the host. Most recent data indicate that periodontal disease may confer risk for coronary heart disease and pre-term low birth weight.

Periodontal Diseases: Epidemiology

HBSC, a WHO collaborative cross-national study, collects data on 11-, 13and 15-yearold boys’ and girls’ health and well-being, social environments and health behaviours every four years. The international report, which is written and produced by the HBSC Research Network and is published by the WHO Regional Office for Europe, presents the world’s most comprehensive picture of young people’s health and well-being. Social determinants of health and well-being among young people

Social determinants of health and well-being among young people

This study is part of the Cross-National Survey on Health Behaviour in School-aged Children--a WHO Collaborative Study, which started in 1982. The aim of the study was to describe the oral hygiene habits (toothbrushing and flossing) of 11-year-old schoolchildren in 22 European countries (Austria, Belgium, the Czech Republic, Denmark, Estonia, FInland, France, Germany, Greenland, Hungary, Israel, Latvia, Lithuania, Northern Ireland, Norway, Poland, Russia, Scotland, the Slovak Republic, Spain, Sweden, and Wales) and Canada. The data were collected from standardized anonymous questionnaires in school classrooms during the 1993-1994 school year. At least 1300 school children, representing the whole country, participated in the study in each country. Oral hygiene habits were analyzed according to gender, age, country, school performance, and family economy. The children brushed most favorably in Sweden, Denmark, German, Austria, and Norway (83-73% brushed twice a day). More-than-once-a-day toothbrushing was especially uncommon (from 26 to 33%) among boys in Finland, Lithuania, Russia, Estonia, and Latvia. Toothbrushing frequency differed significantly according to school performance in Canada, the Czech Republic, Scotland, Poland, Northern Ireland, and Wales and between different socio-economic groups in Northern Ireland, Wales, the Czech Republic, Scotland, Poland, and Russia. Use of dental floss was rare. In general, flossing was less frequent among boys than among girls. Daily flossing was most common among Canadian adolescents (25%). In conclusion, there are considerable differences in toothbrushing frequency among children in European countries.

Oral Hygiene Habits of 11-year-old Schoolchildren in 22 European Countries and Canada in 1993/1994

The IADR Global Oral Health Inequalities Task Group on Dental Caries has synthesized current evidence and opinion to identify a five-year implementation and research agenda which should lead to improvements in global oral health, with particular reference to the implementation of current best evidence as well as integrated action to reduce caries and health inequalities between and within countries. The Group determined that research should: integrate health and oral health wherever possible, using common risk factors; be able to respond to and influence international developments in health, healthcare, and health payment systems as well as dental prevention and materials; and exploit the potential for novel funding partnerships with industry and foundations. More effective communication between and among the basic science, clinical science, and health promotion/public health research communities is needed. Translation of research into policy and practice should be a priority for all. Both community and individual interventions need tailoring to achieve a more equal and person-centered preventive focus and reduce any social gradient in health. Recommendations are made for both clinical and public health implementation of existing research and for caries-related research agendas in clinical science, health promotion/public health, and basic science.

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Global Oral Health Inequalities: Dental Caries Task Group—Research Agenda

Cross-cultural differences of self-reported oral health behaviour in Japanese and Finnish dental students.

BACKGROUND: Health auxiliary personnel have an important role in oral health promotion when they graduate and start working in the health care system. This study aims to find out oral health knowledge and oral health behavior of male Health Sciences College students. METHODS: A questionnaire was distributed to all students at the male Health Sciences College in Kuwait (N = 153) during the academic year 2001/2002. The students filled the anonymous questionnaire in the class after the lecture. The response rate was 84% (n = 128). The questions consisted information on the general background, oral health behavior and oral health knowledge. RESULTS: Oral health knowledge seemed to be limited and very few background factors were associated with it. More than half of the students had visited a dentist during the previous 12 months, but only one third of students were brushing twice a day or more often. CONCLUSIONS: It may be concluded that the male Health Sciences College students seemed to have appropriate knowledge on some oral health topics, but limited knowledge on the others. Their toothbrushing practices are still far behind the international recommendation (twice a day) and also the knowledge, why it should be done so frequently also very limited.

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Oral health knowledge and behavior among male health sciences college students in Kuwait.

Objective The aim of the study was to assess the caries experience of disabled children and young adults in Kuwait, to set baseline data, and to determine their treatment need. Method Dental caries was scored by surface in accordance with WHO criteria. The study population comprised 832 disabled children and young adults (3-29 years; mean age 12.1 years) who were visually impaired, hearing impaired, had physical handicaps or developmental disorders, attending special needs schools. Results The proportion of caries free subjects in the primary dentition (3-12-year-old children) was 11.2%. The mean dmft was 5.4, and dmfs 15.2, being highest in the Down's syndrome and lowest in the blind. The proportion of caries-free subjects in permanent dentition, over 5 years of age was 24.2%. The smallest percentage of caries-free subjects was found in the hearing impaired (16.4%) and highest percentage in the blind (35.5%). The mean DMFT was 4.5 and the DMFS 8.7, being highest in the Down's syndrome and lowest in the blind. Prevalence of untreated decay was highest in hearing impaired (86%). The caries experience of first permanent molars represented the largest proportion of the DMFT score (53.6%). In the permanent dentition increasing age, impaired hearing, and poor oral hygiene were significantly associated with caries risk. Conclusions Caries experience among this disabled population was clearly higher than among the respective age groups in a previous national population survey. The study confirmed the need for strengthening organised preventive and restorative care for this population in Kuwait.

Eino Honkala

Papers

Oral Hygiene Habits of 11-year-old Schoolchildren in 22 European Countries and Canada in 1993/1994

Global Oral Health Inequalities: Dental Caries Task Group—Research Agenda

Cross-cultural differences of self-reported oral health behaviour in Japanese and Finnish dental students.

Oral health knowledge and behavior among male health sciences college students in Kuwait.

Dental caries experience of disabled children and young adults in Kuwait.