Factors associated with population rates of (A) PID, (B) ectopic pregnancy and (C) ectopic pregnancy rates per 1000 live births, 2009–2014
| All admissions | All emergency department | Non-admitted emergency department | ||||||||||
| Univariable | Multivariable | Univariable | Multivariable | Univariable | Multivariable | |||||||
| IRR | (95% CI) | aIRR | (95% CI) | IRR | (95% CI) | aIRR | (95% CI) | IRR | (95% CI) | aIRR | (95% CI) | |
| (A) PID | ||||||||||||
| Age group in years | ||||||||||||
| 15–24 | 1.11 | (1.05 to 1.16) | 1.09 | (1.04 to 1.14) | 2.78 | (2.62 to 2.94) | 2.72 | (2.57 to 2.87) | 3.12 | (2.92 to 3.34) | 3.02 | (2.84 to 3.22) |
| 25–34 | 1.02 | (0.97 to 1.07) | 1.01 | (0.96 to 1.06) | 2.09 | (1.98 to 2.21) | 2.11 | (2.00 to 2.23) | 2.25 | (2.11 to 2.40) | 2.26 | (2.12 to 2.41) |
| 35–44 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| Area of residence | ||||||||||||
| Metropolitan | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| Inner regional | 1.23 | (1.17 to 1.29) | 1.12 | (1.07 to 1.18) | 1.63 | (1.51 to 1.75) | 1.46 | (1.36 to 1.56) | 1.72 | (1.58 to 1.87) | 1.53 | (1.41 to 1.65) |
| Outer regional/remote | 1.75 | (1.63 to 1.87) | 1.57 | (1.47 to 1.69) | 2.28 | (2.02 to 2.57) | 2.08 | (1.87 to 2.32) | 2.26 | (1.96 to 2.60) | 2.06 | (1.81 to 2.34) |
| Socioeconomic status of area | ||||||||||||
| Deciles of increasing disadvantage | 1.06 | (1.05 to 1.07) | 1.05 | (1.04 to 1.06) | 1.09 | (1.08 to 1.10) | 1.07 | (1.06 to 1.08) | 1.09 | (1.08 to 1.10) | 1.08 | (1.07 to 1.09) |
| Year | ||||||||||||
| 2009 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| 2010 | 1.07 | (1.00 to 1.15) | 1.07 | (1.00 to 1.15) | 1.13 | (1.04 to 1.23) | 1.13 | (1.05 to 1.22) | 1.13 | (1.02 to 1.24) | 1.14 | (1.04 to 1.24) |
| 2011 | 1.14 | (1.07 to 1.23) | 1.14 | (1.07 to 1.22) | 1.32 | (1.21 to 1.45) | 1.32 | (1.22 to 1.42) | 1.30 | (1.18 to 1.44) | 1.29 | (1.18 to 1.41) |
| 2012 | 1.09 | (1.01 to 1.16) | 1.09 | (1.02 to 1.16) | 1.42 | (1.30 to 1.55) | 1.41 | (1.31 to 1.53) | 1.39 | (1.26 to 1.54) | 1.40 | (1.28 to 1.53) |
| 2013 | 1.12 | (1.04 to 1.20) | 1.12 | (1.05 to 1.20) | 1.48 | (1.36 to 1.62) | 1.50 | (1.39 to 1.62) | 1.37 | (1.24 to 1.52) | 1.40 | (1.28 to 1.53) |
| 2014 | 1.04 | (0.97 to 1.12) | 1.05 | (0.98 to 1.12) | 1.33 | (1.22 to 1.45) | 1.34 | (1.24 to 1.45) | 1.22 | (1.11 to 1.35) | 1.22 | (1.12 to 1.33) |
| (B) Ectopic pregnancy (population rates) | ||||||||||||
| Age group in years | ||||||||||||
| 15–24 | 0.72 | (0.69 to 0.76) | 0.70 | (0.67 to 0.74) | 1.03 | (0.97 to 1.10) | 1.00 | (0.95 to 1.06) | 0.95 | (0.82 to 1.09) | 0.95 | (0.83 to 1.09) |
| 25–34 | 2.05 | (1.98 to 2.13) | 2.04 | (1.96 to 2.12) | 2.33 | (2.21 to 2.45) | 2.32 | (2.20 to 2.44) | 2.10 | (1.84 to 2.40) | 2.08 | (1.82 to 2.38) |
| 35–44 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| Area of residence | ||||||||||||
| Metropolitan | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| Inner regional | 1.12 | (1.06 to 1.19) | 1.16 | (1.10 to 1.22) | 1.16 | (1.08 to 1.24) | 1.16 | (1.09 to 1.23) | 0.84 | (0.69 to 1.03) | 0.91 | (0.75 to 1.11) |
| Outer regional/remote | 1.46 | (1.35 to 1.59) | 1.43 | (1.32 to 1.55) | 1.19 | (1.09 to 1.31) | 1.13 | (1.04 to 1.24) | 0.64 | (0.45 to 0.92) | 0.69 | (0.49 to 0.96) |
| Socioeconomic status of area | ||||||||||||
| Deciles of increasing disadvantage | 1.03 | (1.02 to 1.04) | 1.03 | (1.03 to 1.04) | 1.05 | (1.04 to 1.06) | 1.05 | (1.04 to 1.06) | 1.01 | (1.00 to 1.03) | 1.02 | (1.00 to 1.04) |
| Year | ||||||||||||
| 2009 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| 2010 | 0.97 | (0.91 to 1.03) | 0.97 | (0.92 to 1.02) | 0.96 | (0.89 to 1.03) | 0.95 | (0.89 to 1.02) | 0.93 | (0.79 to 1.10) | 0.94 | (0.80 to 1.10) |
| 2011 | 1.01 | (0.95 to 1.07) | 1.01 | (0.95 to 1.06) | 0.98 | (0.91 to 1.05) | 0.97 | (0.91 to 1.04) | 0.92 | (0.79 to 1.06) | 0.92 | (0.80 to 1.06) |
| 2012 | 0.96 | (0.91 to 1.03) | 0.96 | (0.90 to 1.01) | 1.12 | (1.04 to 1.20) | 1.09 | (1.02 to 1.17) | 1.08 | (0.93 to 1.27) | 1.07 | (0.92 to 1.25) |
| 2013 | 1.01 | (0.95 to 1.08) | 1.00 | (0.94 to 1.06) | 1.14 | (1.05 to 1.22) | 1.12 | (1.04 to 1.20) | 1.08 | (0.92 to 1.27) | 1.08 | (0.92 to 1.25) |
| 2014 | 1.00 | (0.94 to 1.06) | 0.97 | (0.92 to 1.03) | 1.14 | (1.06 to 1.24) | 1.12 | (1.05 to 1.20) | 1.23 | (1.04 to 1.44) | 1.17 | (1.00 to 1.37) |
| (C) Ectopic pregnancy (rates among live births)* | ||||||||||||
| Age group in years | ||||||||||||
| 15–24 | 0.89 | (0.85 to 0.93) | 0.89 | (0.87 to 0.91) | 1.27 | (1.15 to 1.40) | 1.27 | (1.24 to 1.31) | 1.23 | (0.83 to 1.83) | 1.24 | (0.83 to 1.83) |
| 25–34 | 0.81 | (0.77 to 0.85) | 0.81 | (0.80 to 0.83) | 0.94 | (0.84 to 1.05) | 0.94 | (0.92 to 0.95) | 0.94 | (0.62 to 1.42) | 0.93 | (0.62 to 1.40) |
| 35–44 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| Year | ||||||||||||
| 2009 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | ||||||
| 2010 | 0.97 | (0.83 to 1.14) | 0.97 | (0.95 to 0.99) | 0.95 | (0.77 to 1.17) | 0.95 | (0.92 to 0.98) | 0.93 | (0.49 to 1.78) | 0.93 | (0.49 to 1.76) |
| 2011 | 1.04 | (0.89 to 1.20) | 1.04 | (1.00 to 1.07) | 1.01 | (0.83 to 1.24) | 1.02 | (0.98 to 1.05) | 0.98 | (0.53 to 1.80) | 0.98 | (0.54 to 1.79) |
| 2012 | 0.97 | (0.84 to 1.14) | 0.98 | (0.95 to 1.00) | 1.12 | (0.91 to 1.38) | 1.13 | (1.09 to 1.16) | 1.12 | (0.63 to 2.00) | 1.12 | (0.63 to 1.97) |
| 2013 | 1.04 | (0.88 to 1.24) | 1.04 | (1.02 to 1.07) | 1.18 | (0.97 to 1.44) | 1.19 | (1.15 to 1.22) | 1.14 | (0.63 to 2.06) | 1.15 | (0.64 to 2.05) |
| 2014 | 1.06 | (0.89 to 1.25) | 1.06 | (1.04 to 1.08) | 1.23 | (1.03 to 1.47) | 1.24 | (1.18 to 1.31) | 1.31 | (0.71 to 2.44) | 1.32 | (0.71 to 2.45) |
↵*Level of socioeconomic disadvantage and remoteness of area were not included as variables in the analysis of ectopic pregnancy rates among live births because these denominator data were not available at postcode level.
aIRR, adjusted incidence rate ratio; IRR, incidence rate ratio; PID, pelvic inflammatory disease.