Table 9 Participants (N = 255), total outcome counts (between date of index release and three-month follow-up), outcome counts stratified by model covariates and results of generalised linear models for health service outcomes, reported as adjusted incidence rate ratios (AIRR)

Post-release OAT use

None

148 (58)

227 (33)

REF

82 (42)

REF

57 (42)

REF

29 (34)

REF

153 (43)

REF

Interrupted

32 (13)

127 (18)

3.02 (1.88–4.86)

33 (17)

2.56 (1.41–4.67)

27 (20)

2.71 (1.42–5.20)

26 (30)

4.61 (2.24–9.48)

37 (10)

1.26 (0.71–2.23)

Complete

75 (29)

343 (49)

3.66 (2.57–5.23)

79 (41)

2.55 (1.60–4.07)

52 (38)

2.27 (1.33–3.87)

31 (36)

1.56 (0.78–3.10)

163 (46)

2.30 (1.52–3.48)

Age (mean, [SD^a])

36 (8)

–

1.03 (1.01–1.05)

–

1.04 (1.01–1.07)

–

1.03 (1.00–1.06)

–

1.00 (0.97–1.04)

–

1.06 (1.03–1.08)

Aboriginal and/or Torres Strait Islander

40 (16)

70 (10)

0.70 (0.43–1.13)

26 (13)

0.80 (0.44–1.47)

12 (9)

0.67 (0.32–1.42)

7 (8)

0.78 (0.30–2.03)

41 (12)

0.73 (0.42–1.25)

Self-reported fair or poor health

75 (29)

223 (32)

1.59 (1.07–2.36)

72 (37)

1.30 (0.80–2.13)

39 (29)

0.76 (0.43–1.34)

26 (30)

1.05 (0.51–2.15)

133 (38)

1.26 (0.82–1.94)

GHQ-12 Score

3 (1–6)

–

0.98 (0.93–1.03)

–

0.99 (0.92–1.06)

–

1.04 (0.96–1.13)

–

1.07 (0.97–1.17)

–

0.98 (0.92–1.05)

Area of residence

Metro

129 (51)

394 (57)

REF

103 (53)

REF

82 (60)

REF

57 (66)

REF

205 (58)

REF

Regional

84 (33)

195 (28)

0.78 (0.54–1.15)

68 (35)

0.98 (0.60–1.58)

34 (25)

0.58 (0.34–1.01)

11 (13)

0.31 (0.14–0.68)

120 (34)

0.89 (0.58–1.36)

Prison/other

42 (16)

108 (15)

1.07 (0.64–1.79)

23 (12)

0.80 (0.40–1.60)

20 (15)

0.69 (0.32–1.47)

18 (21)

0.60 (0.24–1.52)

28 (8)

0.60 (0.32–1.13)

Main drug injected in the last 30 days

Heroin

32 (13)

103 (15)

REF

31 (16)

REF

20 (15)

REF

12 (14)

REF

55 (16)

REF

Methamphetamine

72 (28)

139 (20)

1.14 (0.65–1.99)

44 (23)

1.09 (0.52–2.26)

33 (24)

1.23 (0.55–2.73)

12 (14)

0.58 (0.20–1.66)

51 (14)

0.99 (0.51–1.91)

Methamphetamine and Heroin

53 (21)

151 (22)

1.38 (0.79–2.40)

31 (16)

0.82 (0.40–1.71)

17 (13)

0.72 (0.31–1.66)

10 (12)

0.41 (0.14–1.21)

73 (21)

1.67 (0.90–3.11)

No heroin or methamphetamine

98 (38)

304 (44)

1.69 (1.00–2.87)

88 (45)

1.74 (0.88–3.42)

66 (49)

2.05 (0.99–4.27)

52 (60)

1.95 (0.80–4.78)

174 (49)

2.53 (1.40–4.56)

Self-reported lifetime chronic health condition

170 (67)

458 (66)

0.81 (0.58–1.15)

144 (74)

1.17 (0.73–1.88)

95 (70)

1.11 (0.66–1.88)

66 (77)

1.47 (0.74–2.93)

249 (71)

0.93 (0.62–1.38)

Self-reported lifetime mental health condition

213 (84)

585 (84)

1.15 (0.74–1.79)

177 (91)

2.04 (1.07–3.90)

121 (89)

1.64 (0.83–3.27)

75 (87)

1.18 (0.52–2.65)

308 (87)

1.51 (0.90–2.56)

Times moved since last interview (median, [IQR^b])

1 (0–3)

–

0.91 (0.72–1.15)

–

1.11 (0.83–1.50)

–

0.94 (0.67–1.33)

–

1.21 (0.79–1.86)

–

1.07 (0.82–1.39)

Self-reported unstable accommodation

40 (16)

108 (15)

0.84 (0.49–1.44)

40 (21)

0.94 (0.47–1.88)

21 (15)

0.83 (0.37–1.89)

24 (28)

1.24 (0.50–3.06)

53 (15)

0.80 (0.43–1.47)

Current support worker

72 (28)

261 (37)

1.78 (1.25–2.52)

75 (39)

1.35 (0.85–2.13)

56 (41)

1.82 (1.11–3.00)

27 (31)

0.98 (0.52–1.85)

104 (29)

1.01 (0.67–1.52)

Model constant

–

–

0.00 (0.00–0.01)

–

0.00 (0.00–0.00)

–

0.00 (0.00–0.00)

–

0.00 (0.00–0.01)

–

0.00 (0.00–0.00)