Table 2 Factors associated with IUD prescribing by age group
From: The levonorgestrel intrauterine device in Australia: analysis of prescribing data 2008–2012
15–19 | 20–24 | 25–29 | 30–34 | 35–39 | 40–44 | 45–49 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
IRR1 | Adjusted IRR | IRR | Adjusted IRR | IRR | Adjusted IRR | IRR | Adjusted IRR | IRR | Adjusted IRR | IRR | Adjusted IRR | IRR | Adjusted IRR | |
Supply Year | 1.24 (1.22–1.27) | 1.24 (1.22–1.27) | 1.16 (1.15–1.18) | 1.16 (1.15–1.18) | 1.09 (1.08–1.10) | 1.10 (1.08–1.11) | 1.05 (1.04–1.06) | 1.05 (1.04–1.06) | 1.06 (1.06–1.07) | 1.06 (1.06–1.07) | 1.09 (1.08–1.10) | 1.09 (1.08–1.10) | 1.10 (1.09–1.11) | 1.10 (1.09–1.11) |
Remoteness | ||||||||||||||
Major City | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
Inner Regional | 1.62 (1.38–1.92) | 1.57 (1.35–1.83) | 2.09 (1.79–2.45) | 2.08 (1.79–2.43) | 1.99 (1.74–2.28) | 2.01 (1.74–2.31) | 1.52 (1.37–1.68) | 1.54 (1.38–1.72) | 1.21 (1.12–1.30) | 1.22 (1.12–1.32) | 1.09 (1.01–1.18) | 1.10 (1.02–1.19) | 1.07 (0.98–1.16) | 1.07 (0.99–1.17) |
Outer Regional | 1.90 (1.59–2.26) | 1.77 (1.48–2.13) | 2.40 (2.01–2.87) | 2.39 (1.97–2.89) | 2.10 (1.81–2.42) | 2.13 (1.80–2.52) | 1.55 (1.39–1.72) | 1.60 (1.40–1.83) | 1.18 (1.09–1.29) | 1.20 (1.09–1.33) | 1.12 (1.04–1.21) | 1.14 (1.05–1.24) | 1.12 (1.03–1.21) | 1.13 (1.03–1.24) |
Remote | 1.06 (0.58–1.93) | 1.62 (1.00–2.63) | 1.66 (0.95–2.93) | 2.54 (1.78–3.63) | 1.35 (0.80–2.30) | 2.10 (1.47–3.00) | 1.04 (0.68–1.59) | 1.60 (1.25–2.07) | 0.87 (0.61–1.26) | 1.24 (0.92–1.67) | 0.88 (0.62–1.24) | 1.16 (0.83–1.62) | 0.94 (0.76–1.17) | 1.14 (0.87–1.50) |
Very Remote | 1.73 (1.06–2.83) | 3.01 (1.98–4.58) | 1.87 (1.28–2.75) | 3.11 (2.06–4.68) | 1.59 (1.16–2.19) | 2.70 (1.83–3.93) | 1.12 (0.91–1.39) | 1.90 (1.36–2.64) | 0.89 (0.74–1.07) | 1.36 (0.93–1.98) | 0.92 (0.69–1.21) | 1.28 (0.86–1.91) | 0.89 (0.68–1.16) | 1.12 (0.74–1.70) |
AMS | ||||||||||||||
None | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
Yes | 1.40 (1.18–1.66) | 1.16 (1.00–1.35) | 1.33 (1.08–1.65) | 1.02 (0.86–1.20) | 1.20 (0.97–1.49) | 0.96 (0.81–1.14) | 1.07 (0.91–1.26) | 0.93 (0.80–1.08) | 1.03 (0.93–1.14) | 0.97 (0.88–1.07) | 1.01 (0.93–1.09) | 0.97 (0.89–1.05) | 1.01 (0.93–1.10) | 0.98 (0.89–1.07) |
Remote AMS | 1.18 (0.69–2.02) | 0.55 (0.32–0.95) | 1.37 (0.91–2.05) | 0.56 (0.36–0.89) | 1.14 (0.80–1.61) | 0.54 (0.35–0.83) | 1.07 (0.68–0.02) | 0.53 (0.38–0.75) | 0.76 (0.62–0.94) | 0.61 (0.42–0.88) | 0.80 (0.62–1.05) | 0.67 (0.45–1.00) | 0.84 (0.69–1.03) | 0.76 (0.53–1.10) |
Family Planning | ||||||||||||||
No | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
Yes | 1.21 (0.90–1.63) | 1.25 (0.90–1.72) | 1.09 (0.74–1.47) | 0.97 (0.75–1.26) | 0.95 (0.72–1.24) | 0.97 (0.78–1.50) | 0.92 (0.77–1.10) | 0.93 (0.78–1.11) | 0.96 (0.86–1.08) | 0.97 (0.87–1.09 | 0.97 (0.87–1.07) | 0.98 (0.88–1.08) | 1.00 (0.89–1.12) | 1.00 (0.89–1.13) |