From the Illicit Drug Reporting System (IDRS),56-62 the proportions of IDUs who did not inject in the last month, injected weekly or less, injected more than weekly, injected once daily, injected two to three times per day, and injected more than three times per day were estimated over time as shown below (see the figure frequency of injection).

We assume that IDUs who did not inject in the last month inject an average of once every two months; those who inject weekly or less inject an average of once every fortnight; those who inject more than weekly inject once every five days on average; IDUs who inject two to three times per day inject an average of 2.5 times per day; and those who inject more than three times each day inject an average of four to five times per day. Among Aboriginal and Torres Strait Islander IDUs, we assume that those who did not inject during the last month inject an average of once every two months; those who inject less than daily inject an average of once every ten days; and those who inject daily or more inject an average of two times per day. Based on those estimates, we calculated the average number of injections per IDU per year as a weighted average. Mean and 95% confidence intervals for the trend in injecting frequency for each state/territory was calculated and are shown below (see the figure mean and 95% confidence intervals).

Frequency of injection last month (%) among IDUs in Australia by state and territory (%) (2000-2007)



Text equivalent below for Frequency of injection last month (%) among IDUs in Australia (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in the ACT (%) (2000-2007)
Text equivalent below for Frequency of injection last month (%) among IDUs in NSW (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in the NT (%) (2000-2007)
Text equivalent below for Frequency of injection last month (%) among IDUs in SA (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in QLD (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in TAS (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in VIC (%) (2000-2007)Text equivalent below for Frequency of injection last month (%) among IDUs in WA (%) (2000-2007)Top of pageText equivalent below for Frequency of injection last month (%) among Indigenous IDUs in Australia (%) (1999-2007)

Text version of frequency of injection last month (%) among IDUs in Australia by state and territory (%) (2000-2007)

Figures in this description are approximate as they have been read from the graph.

Frequency of injection last month (%) among IDUs in Australia by state and territory (%) (2000-2007) consists of ten graphs:

Australia

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
2
2
0
0
0
0
0
0
Weekly or less
16
20
18
16
19
19
19
16
More than weekly
30
34
36
38
35
38
35
36
Once daily
17
14
14
17
16
16
17
17
2-3 times a day
22
20
21
20
24
21
20
21
More than 3 times a day
13
10
11
9
6
6
9
6

Australian Capital Territory

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
6
4
0
0
6
3
0
0
Weekly or less
25
32
27
12
22
23
32
25
More than weekly
18
28
44
34
31
45
34
48
Once daily
10
9
11
23
21
7
16
12
2-3 times a day
30
15
14
26
18
18
12
11
More than 3 times a day
11
12
4
5
3
6
6
4

New South Wales

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
0
0
0
1
1
3
1
1
Weekly or less
8
8
5
9
9
11
20
9
More than weekly
19
22
22
24
33
23
27
30
Once daily
15
12
10
11
10
17
15
24
2-3 times a day
29
26
32
33
32
28
20
28
More than 3 times a day
31
32
31
22
15
18
17
8
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Northern Territory

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
3
3
1
1
0
0
1
0
Weekly or less
15
16
10
8
18
16
20
18
More than weekly
15
21
9
32
25
30
18
26
Once daily
22
12
23
21
20
15
20
19
2-3 times a day
30
41
49
32
31
39
39
30
More than 3 times a day
15
7
8
6
6
0
2
7

Queensland

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
2
7
0
0
1
1
0
0
Weekly or less
24
28
21
40
28
23
28
18
More than weekly
30
22
31
26
32
31
30
35
Once daily
14
9
19
16
11
18
16
16
2-3 times a day
20
16
24
11
21
20
16
24
More than 3 times a day
10
18
5
7
6
7
10
7

South Australia

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
0
4
1
2
0
0
1
1
Weekly or less
26
23
27
10
32
26
27
27
More than weekly
42
38
40
41
30
42
41
40
Once daily
14
14
7
15
14
12
14
12
2-3 times a day
12
18
15
23
18
15
12
14
More than 3 times a day
6
3
10
9
6
6
6
6
Top of page

Tasmania

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
1
0
0
0
0
0
0
0
Weekly or less
8
9
9
15
20
8
7
18
More than weekly
60
62
62
68
53
62
56
61
Once daily
20
17
10
8
13
12
19
10
2-3 times a day
11
8
13
6
10
16
12
9
More than 3 times a day
0
4
6
3
4
2
6
2

Victoria

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
3
2
0
0
0
2
2
2
Weekly or less
6
21
23
18
17
23
10
13
More than weekly
22
33
32
34
31
36
34
26
Once daily
22
16
19
26
17
14
21
23
2-3 times a day
33
22
17
18
28
17
21
29
More than 3 times a day
14
6
9
4
7
8
10
7

Western Australia

2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
1
0
0
2
1
1
0
1
Weekly or less
16
22
24
17
10
22
11
11
More than weekly
41
48
49
40
49
30
40
31
Once daily
25
15
9
23
20
22
14
29
2-3 times a day
15
11
10
13
17
23
27
18
More than 3 times a day
2
4
8
5
3
2
8
10

Indigenous Australians

1999 (%)2000 (%)2001 (%)2002 (%)2003 (%)2004 (%)2005 (%)2006 (%)2007 (%)
Not in last month
7
6
10
12
10
6
8
12
8
Less than daily
23
26
38
30
36
40
35
38
43
Daily or more
70
68
52
58
54
54
56
50
49
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Mean and 95% confidence intervals for the trend in injecting frequency for each state/territory (1999-2007)


Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in Australia (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in the ACT (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in NSW (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in the NT (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in QLD (1999-2006)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in SA (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in TAS (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in VIC (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in WA (1999-2007)Text equivalent below for Mean and 95% confidence intervals for the trend in injecting frequency in Indigenous IDUs (1999-2007)
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Text version of mean and 95% confidence intervals for the trend in injecting frequency for each state/territory

Figures in this description are approximate as they have been read from the graph.

Mean and 95% confidence intervals for the trend in injecting frequency among Australia IDUs for each state and territory (1999-2007) consists of ten graphs:
    • Injecting frequency among Australian IDUs
      • The 95% confidence interval narrows from a range of 440-510 in 1999 to 410-450 in 2003 before widening to 340-420 in 2007.
      • The mean decreases gradually from 480 in 1999 to 380 in 2007.

    • Injecting frequency among Australian IDUs in the Australian Capital Territory
      • The 95% confidence interval narrows from a range of 405-600 in 1999 to 310-420 in 2003 before widening to 140-320 in 2007.
      • The mean decreases gradually from 500 in 1999 to 230 in 2007.

    • Injecting frequency among Australian IDUs in New South Wales
      • The 95% confidence interval narrows from a range of 840-1,000 in 1999 to 670-770 in 2003 before widening to 430-600 in 2007.
      • The mean decreases gradually from 920 in 1999 to 520 in 2007.

    • Injecting frequency among Australian IDUs in the Northern Territory
      • The 95% confidence interval narrows from a range of 550-700 in 1999 to 490-570 in 2003 before widening to 460-520 in 2007.
      • The mean decreases gradually from 620 in 1999 to 440 in 2007.

    • Injecting frequency among Australian IDUs in Queensland
      • The 95% confidence interval narrows from a range of 370-510 in 1999 to 370-440 in 2003 before widening to 310-450 in 2006.
      • The mean decreases gradually from 39 in 1999 to 60 in 2007.

    • Injecting frequency among Australian IDUs in South Australia
      • The 95% confidence interval narrows from a range of 260-410 in 1999 to 280-370 in 2003 before widening to 250-390 in 2007.
      • The mean decreases gradually from 320 in 1999 to 310 in 2007.

    • Injecting frequency among Australian IDUs in Tasmania
      • The 95% confidence interval narrows from a range of 180-300 in 1999 to 210-280 in 2003 before widening to 190-320 in 2007.
      • The mean decreases gradually from 220 in 1999 to 260 in 2007.

    • Injecting frequency among Australian IDUs in Victoria
      • The 95% confidence interval narrows from a range of 390-680 in 1999 to 390-550 in 2003 before widening to 270-550 in 2007.
      • The mean decreases gradually from 520 in 1999 to 400 in 2007.

    • Injecting frequency among Australian IDUs in Western Australia
      • The 95% confidence interval narrows from a range of 200-300 in 1999 to 300-370 in 2003 before widening to 380-490 in 2007.
      • The mean decreases gradually from 250 in 1999 to 420 in 2007.

    • Injecting frequency among Australian IDUs in Indigenous Australians
      • The 95% confidence interval narrows from a range of 440-520 in 1999 to 400-460 in 2003 before widening to 320-410 in 2007.
      • The mean decreases gradually from 490 in 1999 to 370 in 2007.

Top of pageThe graphs also show the average number of injections per IDU in Australia by state and territory:
ACT
NSW
NT
QLD
SA
TAS
VIC
WA
Indigenous
Australia
1999
530
850
620
450
305
220
620
295
520
490
2000
530
850
620
450
305
220
620
295
520
490
2001
410
840
560
480
300
250
370
250
395
440
2002
270
880
670
390
380
290
400
300
440
450
2003
420
740
480
320
440
185
360
315
400
405
2004
300
590
470
360
350
250
450
320
400
400
2005
310
630
440
390
320
270
380
370
420
390
2006
280
550
470
410
285
300
470
450
380
440
2007
250
500
470
-
395
200
495
470
370
400
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