Table 2

Characteristics of New South Wales opioid substitution therapy registrants, by BBV notification status, 1993–2007

Entire subcohortNo BBV infectionHBV monoinfectionHCV monoinfectionHBV/HCV co-infectionHIV infection†
Person-yearsPerson-yearsPerson-yearsPerson-yearsPerson-yearsPerson-years
Number (%) of registrants*TotalMedianNumber (%) of registrantsTotalMedianNumber (%) of registrantsTotalMedianNumber (%) of registrantsTotalMedianNumber (%) of registrantsTotalMedianNumber (%) of registrantsTotalMedian
Total29 613 (100)213 0087.2823 650 (100)109 3133.53598 (100)26083.5614 892 (100)94 3316.36898 (100)52496.02234 (100)15046.20
Sex
 Men20 348 (68.7)144 9327.1916 352 (69.1)76 4953.64436 (72.9)19183.609793 (65.8)61 3786.29643 (71.6)37826.10204 (87.2)13556.55
Women9265 (31.3)68 0767.517298 (30.9)32 8183.25162 (27.1)6913.505099 (34.2)32 9536.47255 (28.4)14665.9430 (12.8)1484.35
Age at cohort entry (years)
 <2511 674 (39.4)87 0887.609915 (41.9)47 3403.81278 (46.5)12823.965706 (38.3)35 9636.41351 (39.1)21306.2761 (26.1)3736.08
 25–308427 (28.5)60 9077.326771 (28.6)31 9053.56169 (28.3)7703.184106 (27.6)26 2016.42266 (29.6)15345.7968 (29.1)4947.73
 ≥319512 (32.1)65 0136.746964 (29.4)30 0683.06151 (25.3)5553.395080 (34.1)32 1676.23281 (31.3)15845.71105 (44.9)6375.17
Year of cohort entry
1993–199710 212 (34.5)111 45411.78944 (37.8)54 6194.76158 (26.4)9815.083563 (23.9)36 13211.2129 (14.4)129810.984 (35.9)75410.7
1998–200211 655 (39.4)81 3997.368962 (37.9)42 0955.35290 (48.5)13045.126958 (46.7)47 0497.05475 (52.9)31676.8082 (35.0)5737.55
2003–20077746 (26.2)20 1552.705744 (24.3)12 5992.11150 (25.1)3232.014371 (29.4)11 1502.55294 (32.7)7842.7568 (29.1)1772.71
  • *Category numbers will not sum to total numbers for the subcohort as individuals were followed up in a time-dependent manner, allowing an individual to contribute person-years to multiple groups as their BBV notification status changed over the period of observation.

  • †With or without HBV or HCV notification.

  • BBV, blood-borne viruses; HBV, hepatitis B virus; HCV, hepatitis C virus.