Table 1

SNA measures used in this study

SNA measureDefinitionCommon interpretationImpact on intervention
IndegreeNumber of nominations an individual has received.Leadership ability, social recognition or popularity.Highly connected people are an important channel of information. The interventions carried out could affect a group of connected people but in return would not affect us less connected or important subgroups located on the periphery of the network
OutdegreeNumber of nominations issued by an individual.Ability to reach out to other adjacent individuals Sociability. Expansiveness
DegreeNumber of total connections an individual has.Social activity
InclosenessMinimum distance from any node in the network to reach a given node.AccessibilityPeople with a high degree of closeness could spread the information in the fastest way
OutclosenessMinimum distance from a node to reach the rest of the nodes in the entire network.Communication skills
BetweennessNumber of times a student appears on the shortest path between any pair of peers.Interpersonal influencePeople with a high degree of intermediation control the flow of information. They are able to link groups, subgroups or individuals and are ideal when healthy behaviour is to be propagated. Conversely, they can be detrimental to negative health behaviours in the past.
EigenvectorEigenvector means that the centrality of each node is proportional to the sum of the centralities of the nodes it is adjacent to, in effect, when it comes to eigenvector centrality a node is a central as its network.Degree of influence or prestigeBonacich91 suggests that power or recognition cannot be studied by traditional measures of centrality, and that this measure combines not only the degree of connection but also that of proximity.
  • Source: Own elaboration based on44 65 68 91–93.