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Table 5 Results of comparison B (metal-backed versus all-polyethylene) for Analyses 2 and 3

From: Partial factorial trials: comparing methods for statistical analysis and economic evaluation

  Analysis 2: inside-the-table Analysis 3: Bayesian bootstrap
With patella resurfacing
 Metal backing (N = 34)a
  Cost £8036 (£411) £7925 (£391)
  QALYs 5.518 (0.337) 5.820 (0.248)
  NMBb £102,327 (£6870) £108,467 (£5041)
 All-polyethylene (N = 36)a
  Cost £7833 (£567) £7849 (£550)
  QALYs 5.046 (0.330) 4.989 (0.262)
  NMBb £93,087 (£6837) £91,940 (£5416)
No patella resurfacing
 Metal backing (N = 37)a
  Cost £7782 (£384) £7749 (£357)
  QALYs 4.976 (0.311) 5.117 (0.258)
  NMBb £91,745 (£6348) £94,586 (£5255)
 All-polyethylene (N = 38)a
  Cost £8085 (£409) £8148 (£409)
  QALYs 5.569 (0.248) 5.407 (0.220)
  NMBb £103,293 (£5031) £99,999 (£4451)
  1. Numbers in brackets are SEs
  2. aIn Analysis 3, the bootstraps were weighted using weights calculated using a sample of 257 patients randomised only in comparison B (128 to metal backing and 129 to all-polyethylene) and 1333 patients randomised only in comparison C (673 to patella resurfacing and 660 to no resurfacing)
  3. bAt a £20,000/QALY ceiling ratio