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Table 2 Incidence rate ratios (IRR) and 95% confidence intervals (CI) for leukaemia, lymphoma and CNS tumours in teenagers and young adults, 1996–2005

From: Population mixing for leukaemia, lymphoma and CNS tumours in teenagers and young adults in England, 1996–2005

   Leukaemia Lymphoma CNS Tumoursb
Modela Variables IRR 95% CI P-value IRR 95% CI P-value IRR 95% CI P-value
A Population Mixing 0.92 0.83-1.03 0.144 0.94 0.87-1.01 0.086 0.81 0.74-0.89 <0.001
B Population Mixing 0.93 0.83-1.04 0.222 0.97 0.90-1.04 0.426 0.83 0.75-0.91 <0.001
  Deprivation Score 0.99 0.98-1.00 0.114 0.97 0.96-0.98 <0.001 0.97 0.96-0.99 <0.001
C Population Mixing 0.95 0.84-1.07 0.446 0.97 0.90-1.06 0.529 0.82 0.74-0.91 <0.001
  Deprivation Score 0.99 0.98-1.01 0.609 0.97 0.96-0.98 <0.001 0.97 0.95-0.99 0.001
  Population Densityc 1.00 0.99-1.00 0.433 1.00 1.00-1.00 0.820 1.00 0.99-1.00 0.675
D Population Mixing          
  1st Decile 0.93 0.73-1.19 0.572 0.97 0.83-1.14 0.689 1.35 1.13-1.61 0.001
  2-9th Decile 1 - - 1 - - 1 - -
  10th Decile 0.9 0.77-1.05 0.168 0.98 0.89-1.09 0.718 0.93 0.81-1.06 0.267
  Test for Trend    0.203    0.778    0.075
  Deprivation Score 0.99 0.98-0.99 0.163 0.97 0.96-0.98 <0.001 0.97 0.96-0.98 <0.001
  1. aBest fitting model is highlighted in bold for each diagnostic group, model fit statistics are given in Table 4.
  2. bAnalysis for main CNS tumour subgroups are shown in Table 3.
  3. cPerson-weighted population density.