Table 5

Total change in indirect costs and cost ratio of intervention and control at baseline, 12 months and 24 months (societal perspective) (NZ$ exclusive of goods and services tax)

InterventionControl
TimeMean (95% CI)* (sensitivity analysis)Mean (95% CI)* (sensitivity analysis)Cost ratio (sensitivity analysis)p Value
Baseline (NZ$)731.43 (641.17 to 834.39)714.15 (626.16 to 814.6)1.02 (0.85 to 1.23)0.8
12 months (NZ$)553.85 (482.41 to 635.81) (568.22 (495.66 to 651.38))560.60 (488.87 to 642.91) (569.87 (497.5 to 652.75))0.99 (0.81 to 1.2) (1.00 (0.82 to 1.21))0.9 (0.98)
24 months (NZ$)524.84 (456.82 to 602.93) (529.91 (461.55 to 608.44))517.50 (450.34 to 594.61) (522.54 (455.14 to 599.98))1.01 (0.83 to 1.23) (1.01 (0.83 to 1.23))0.9 (0.9)
  • * Geometric means (95% CIs) are presented.

  • Sensitivity analysis: figures recalculated assuming no change in cost for those with missing values.

  • Refers to the intervention indirect costs: control costs at each time point.