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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)
  1. 1: IRR incidence rate ratio