TABLE 1—
Descriptive Statistics of Cluster (n = 243): Manitowoc County, WI, 2010–2012
| Variable | No. (%) or Median |
| Total | 243 (100) |
| Gender | |
| Female | 78 (32.1) |
| Male | 131 (53.9) |
| Unknown | 34 (14.0) |
| Median age, y | 29 |
| Female | 28 |
| Male | 30 |
| Age, y | |
| < 25 | 63 (25.9) |
| 25–30 | 54 (22.2) |
| > 30 | 86 (35.4) |
| Unknown | 40 (16.5) |
| HCV statusa | |
| Positive | 80b (69.6) |
| Negative | 35b (30.4) |
| Risk factor | |
| PWID partner | |
| Yes | 189 (77.8) |
| No | 54 (22.2) |
| Unknown | 0 (0.0) |
| Network properties: k-core membershipc | |
| 1-core | 125 (51.4) |
| 2-core | 48 (19.8) |
| 3-core | 42 (17.3) |
| 4-core | 8 (3.3) |
| 5-core | 20 (8.2) |
Note. PWID = person who injects drugs.
a
There were 128 persons with unknown HCV status who were not included in the percentage calculation.
b
Status among those tested.
c
K-core describes a group of people all of whom have at least k connections and are connected to at least k other people in the group. Membership of a 5-core (the highest risk group), for example, means the person has 5 connections, each of whom also have 5 connections to that group.