Table 3

Unadjusted and adjusted RRs for first VTI procedures in a cohort of children in New South Wales, Australia, 2000–2008

Unadjusted RR95% CIp valueAdjusted RR*95%CIp value
Age (years)
 <21.00<0.0011.00<0.001
 2 to <41.361.31 to 1.401.371.31 to 1.40
 4 to <61.171.12 to 1.221.181.12 to 1.22
 6 to 80.490.45 to 0.530.500.45 to 0.53
Sex
 Female1.00<0.0011.00<0.001
 Male1.541.49 to 1.591.541.49 to 1.59
Low birth weight
 No1.00<0.0011.000.005
 Yes1.321.22 to 1.421.151.04 to 1.27
Prematurity
 No1.00<0.0011.00<0.001
 Yes1.341.26 to 1.411.191.10 to 1.28
Private patient or insurance
 No1.00<0.0011.00<0.001
 Yes2.302.23 to 2.371.971.91 to 2.03
Geographical remoteness (ARIA+)
 Major city1.00<0.0011.00<0.001
 Inner regional0.970.93 to 1.001.151.11 to 1.20
 Outer regional0.600.56 to 0.640.970.90 to 1.05
 Remote/very remote0.560.47 to 0.680.890.73 to 1.09
Area socioeconomic status†
 First (most disadvantaged)1.00<0.0011.00<0.001
 Second1.461.38 to 1.541.321.25 to 1.40
 Third1.411.33 to 1.491.221.15 to 1.30
 Fourth1.621.54 to 1.711.331.25 to 1.42
 Fifth (least disadvantaged)2.742.61 to 2.891.951.83 to 2.07
  • *Adjusted for all significant covariates in the final multivariate model.

  • †SEIFA Index of Relative Socio-Economic Advantage and Disadvantage based on the child's statistical local area of residence at birth.

  • ARIA+, Accessibility/Remoteness Index of Australia; SEIFA, socio-economic indices for Areas; RR, rate ratio; VTI, ventilation tube insertion.