Carnegie Mellon University

# Laboratory for the Study of Stress, Immunity, and Disease

## Department of Psychology

Scoring the Social Network Index

MEASURES

• Number of High-Contact Roles (Network Diversity)
• Number of People in Social Network
• Number of Embedded Networks

Number of High-Contact Roles
(Network Diversity

Definition: This is the number of social roles in which the respondent has regular contact (i.e., at least once every 2 weeks) with at least one person.  The maximum number of high-contact roles is 12.   They are: spouse, parent, child, child-in-law, close relative, close friend, church/temple member, student, employee, neighbor, volunteer, and group member.  (It would also be possible to count each group a person belongs to [question 12] as a separate social role, however we have not done this in our previous work.)

Computation:  For each of the 12 possible high-contact roles, assign a 0 if the respondent does not have the role and a 1 if he/she does.  The total number of high-contact roles is computed by summing the 0s and 1s.  The table below shows which scale items are used in the computation and how each is scored.

 Role Item # Scores 1 if response is … spouse 1 1   parent 2a not 0   child 3a not 0   child-in-law 4a not 0   close relative 5a not 0   close friend 6a not 0   church/temple member 7a not 0   student 8a not 0   employee 9a & 9b not 0 for both items   neighbor 10 not 0   volunteer 11a not 0   group member 12 not 0 for # of group members talked to every 2 weeks

Number of People in Social Network

Definition:  This is the total number of people with whom the respondent has regular contact (i.e., at least once every 2 weeks).

Computation:  For each of the 12 possible roles, determine the number of people with whom the respondent has regular contact.  The total number of people in the social network is computed by summing across the 12 roles.  The table below shows which scale items are used in the computation and how each is scored.

 Role Item # Scoring spouse 1 scores 1 if respondent is married, otherwise scores 0  parent 2a use the number indicated  child 3a 1,2=1; 3=2  child-in-law 4a 1,2=1; 3=2  close relative 5a use the number indicated  close friend 6a use the number indicated  church/temple member 7a use the number indicated  student 8a use the number indicated  employee 9a & 9b sum of 9a & 9b  neighbor 10 use the number indicated  volunteer 11a use the number indicated  group member 12 sum of number of group members talked to at least once every 2 wks

NOTE: In our experience, individuals sometimes interpret the SNI item inquiring about the number of "other group" members with whom they interact at least once every 2 weeks more broadly than we intended, with some respondents reporting up to 100 or more fellow group-members. To ensure that social network size scores are not artificially inflated by individuals reporting large group memberships, we recommend recoding the variable so that all values over 6 are given a score of 7, thus keeping it consistent with all other quantitative SNI items.

Number of Embedded Networks

Definition:   This measure is meant to reflect the number of different network domains in which a respondent is active.  The maximum possible is 8.  They are: family, friends, church/temple, school, work,  neighbors, volunteering, and groups.  To receive a point for a domain, a respondent must have at least 4 high-contact people within that domain.  The 5 family roles are collapsed into one network for this measure.  To receive a point for family, they are required to have at least 3 high-contact family roles as well as 4 high-contact people.

Computation: If the subject meets the criteria for an embedded network, assign a score of 1 for that network, otherwise assign a 0.  The total number of embedded networks is computed by summing the 0s and 1s.  The table below shows the criteria used for each embedded network.

 Embedded Network Scores 1 if S has at least 4 high-contact…  Questionnaire Item(s) family  family members and at least 3 high-contact family roles 1, 2a, 3a, 4a, 5a  friends friends 6a  church/ temple church/temple members  7a  school students/teachers 8a  work work associates 9a and 9b  neighbors neighbors 10  volunteering fellow volunteers 11a  groups group members 12

Although we have found this useful in a number of exploratory analyses, we have not published any data using number of embedded networks.

Reference:   Cohen S, Doyle WJ, Skoner DP, Rabin BS, Gwaltney JM (1997).  Social ties and susceptibility to the common cold.  JAMA, 277, 1940-4. Link to full-text (pdf)

Version: July 23, 2014