The size and behaviour of the 'bridging population', which interacts with both IDUs and the general population, as well as STI prevalence, sexual mixing patterns and sexual risk behaviour within the general population, will be crucial in determining the scale of heterosexual HIV spread.
An additional sample size calculation was performed to determine the required sample size to detect prevalence of knowledge, attitudes and behaviour within the target population.
Future work could consider whether the results about individual heterogeneity in terms of frailty could be compared to data describing the heterogeneity of risk behaviour within the IDU population through injecting or sharing behaviour.
This, in other words, means that a high level of life satisfaction and low degree of psychache are proactive against suicidal behaviour within this population.
To further study the relationship between stated and revealed preferences, a similar study on a different type of (health) behaviour should be conducted, preferably on behaviour that shows more variance within the population.
Multilevel community and population-wide interventions are found to work successfully if programmes are designed to take on a longer-term perspective on health improvement, with the goal to ultimately change the wider social environment so that healthy behaviours can be facilitated within the population [ 57- 60].
Our study emphasises the general importance of understanding individual variation in physiology and behaviour within a population of a seriously threatened mammalian species, the Asian elephant, and specifically highlights the need for long-term monitoring of the stress physiology and behavioural responses of individual elephants across both human-dominated and natural landscapes.
Thus, provided alternative forms of bias can be ruled out (see discussion), the level of homogeneity of behaviour within a population potentially provides a metric that can be used probabilistically to detect a social influence on learning.
This calls for context-specific behavioural and policy interventions (1) that attempt to change population behaviour within the framework of other complex issues like culture, society, and family.
