| Research Design: |
Project on Human Development in Chicago
Neighborhoods
The city of Chicago was selected as the research site for the PHDCN
because of its extensive racial, ethnic, and social-class diversity.
The project collapsed 847 census tracts in the city of Chicago into
343 neighborhood clusters (NCs) based upon seven groupings of
racial/ethnic composition and three levels of socioeconomic status.
The NCs were designed to be ecologically meaningful. They were
composed of geographically contiguous census tracts, and geographic
boundaries and knowledge of Chicago's neighborhoods were considered in
the definition of the NCs. Each NC was comprised of approximately
8,000 people.
Longitudinal Cohort Study
For the Longitudinal Cohort Study, a stratified probability sample
of 80 neighborhoods was selected. The 80 NCs were sampled from the 21
strata (seven racial/ethnic groups by three socioeconomic levels) with
the goal of representing the 21 cells as equally as possible to
eliminate the confounding between racial/ethnic mix and socioeconomic
status. Once the 80 NCs were chosen, then block groups were selected
at random within each of the sample neighborhoods. A complete listing
of dwelling units was collected for all sampled block groups.
Pregnant women, children, and young adults in seven age cohorts
(birth, 3, 6, 9, 12, 15, and 18 years) were identified through
in-person screening of approximately 40,000 dwelling units within the
80 NCs. The screening response rate was 80 percent. Children within
six months of the birthday that qualified them for the sample were
selected for inclusion in the Longitudinal Cohort Study. A total of
8,347 participants were identified through the screening. Of the
eligible study participants, 6,228 were interviewed.
For all cohorts except 0 and 18, primary caregivers as well as the
child were interviewed. The primary caregiver was the person found to
spend the most time taking care of the child. Separate research
assistants administered the primary caregiver interviews and the child
interviews. The primary method of data collection was face-to-face
interviewing, although participants who refused to complete the
personal interview were administered a phone interview. Interviews
were conducted in Spanish, English, and Polish. In Wave 1 the complete
protocol was translated into Spanish and Polish. An interpreter was
hired for participants who spoke a language other than English,
Spanish, or Polish. Depending on the age and wave of data collection,
participants were paid between $5 and $20 per interview. Other
incentives, such as free passes to museums, the aquarium, and monthly
drawing prizes were also included.
Interview protocols included a wide range of questions. For
example, some questions assessed impulse control and sensation-seeking
traits, cognitive and language development, leisure activities,
delinquency and substance abuse, friends' activities, and
self-perception, attitudes, and values. Caregivers were also
interviewed about family structure, parent characteristics,
parent-child relationships, parent discipline styles, family mental
health, and family history of criminal behavior and drug use.
Child Behavior Checklist (CBCL)
Completed between 1994 and 1997, the Child Behavior Checklist
(CBCL) was administered to the primary caregiver (defined as the
person(s) found to spend the most time taking care of the subject) of
subjects belonging to Cohorts 3, 6, 9, 12, and 15 of the PHDCN
Longitudinal Cohort Study. The PHDCN CBCL was administered in two
versions--a preschool version geared toward subjects aged 2 to 3,
which contained approximately 100 questionnaire items, and a slightly
longer version (approximately 120 questionnaire items) for subjects
between the ages of 4 and 18. Each instrument also contained 2 to 3
open-ended items for reporting additional behavioral problems. The
questionnaire items were presented in alphabetical order to reduce any
respondent bias that might have occurred as a result of the
respondent's preconceived notion regarding the presence or absence of
a particular disorder. Respondents were asked to rate a list of items
that applied to his or her child's behavior, occurring within the past
six months, on a three-point Likert-type response scale: 0 = not true,
1 = somewhat true, and 2 = very true. Questionnaire items included
"argues a lot," "complains of loneliness," "cruel to animals," "bites
fingernails," "doesn't eat well," "nightmares," "physically attacks
people," "refuses to talk," "talks or walks in sleep," "underactive or
lacks energy," and "wets the bed." The preschool version of the CBCL
was comprised of six narrow-band subscales and two broad-band scales
(listed in the variable description section). The CBCL for the 4 to 18
age group contained eight narrow-band subscales, two broad-band
scales, and a total problems scale. The scales were not mutually
exclusive (i.e., one questionnaire item may contribute to more than
one scale). |
