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Intimate Partner Single Segment Analysis

Research Question 1: Is there a difference between gender and age groups in the types of injuries sustained by victims in violent intimate partner incidents?

This example uses NIBRS data to identify violent offense incidents that involved intimate partners and to compare the types of victim injuries reported by the different genders and age groups.  Prior to the implementation of NIBRS, it was not possible to examine at the national level offender-victim relationships or victim injuries for any offense categories.

The original data file used to answer this research question is the 1999 NIBRS hierarchical data file. The victim segment was produced in Preparing a File For Analysis and was saved as a separate file.

To identify the intimate partner relationships, each of the offender-victim relationship variables is evaluated for each victim segment record. There can be up to 10 victims identified, so up to 10 relationships can be coded. The intimate partner relationships of spouse, common-law spouse, boyfriend/girlfriend, ex-spouse, and homosexual relationship are assigned a value of 1. This value simply serves to identify the category of relationship - intimate partner - that is under examination in this research question. Since not all victim offenses require the reporting of an offender-victim relationship, the most serious victim offense variable defined in Preparing a File For Analysis is used to identify the records that should have an offender-victim relationship code and to assign a numeric value to the relationship codes. Because the FBI does not collect type of injury data for any of the homicide offenses, an additional value for type of injury is defined: death. To answer this sample research question, the type of injury variable is recoded into a grouped variable. The categories of victim injury type are: death, serious physical injury, apparent minor injury, and no injury. The method of analysis is cross-tabulation. The percentage of incidents in each category of victim injury is shown (only the most serious victim injury is reported) for each gender and each age group within each gender. The total number of incidents evaluated for this example is 167,158. The total number of valid cases for this analysis is 147,152 after excluding missing data on gender, age, and types of injury variables.

For both genders, a similar overall pattern for all age groups is that the type of most serious victim injury reported was, in order of decreasing frequency, apparent minor injury, no injury, serious physical injury, and death. Apparent minor injury and no injury account for over 90 percent of the most serious victim injuries for all age groups for both genders. Female and male victims aged 65 or older were more likely than all other age groups of the same gender to die as the result of a violent intimate partner incident. Males were almost twice as likely as females to report a serious physical injury. Male victims of all age groups were more likely to sustain serious physical injury than were female victims of the same age groups. Female victims of all age groups except the youngest (under 18) and the oldest (age 65 and older) were slightly more likely to report an apparent minor injury. Female victims in the youngest and the oldest age groups were more likely than the other female age groups to report no injury sustained. Males in the youngest age group were more likely than the other male victims to report no injury.


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