Table 3. Incidence rate ratios (IRRs) from univariate models for ALL by age group for wards classified according to quintiles of the following variables: percentage of incomers in total, adult and child population; diversity of total, adult and child incomers; population density; and Carstairs deprivation score.
| Age group (years) |
Significance level
|
IRR in each quintile category
|
|||||
|---|---|---|---|---|---|---|---|
| Variable | Heterogeneity | Trend | 1 | 2 | 3 | 4 | 5 |
| Age 0 | |||||||
| % incomers in total population | 0.89 | 0.95 | 1 | 1.09 | 1.17 | 1.21 | 0.93 |
| % incomers in adult population | 0.36 | 0.94 | 1 | 0.84 | 1.42 | 1.09 | 0.89 |
| % incomers in child population | 0.24 | 0.17 | 1 | 1.22 | 1.14 | 0.64 | 0.83 |
| Diversity of total incomers | 0.45 | 0.80 | 1 | 1.33 | 1.42 | 0.87 | 1.20 |
| Diversity of adult incomers | 0.97 | 0.90 | 1 | 1.05 | 1.20 | 1.00 | 1.02 |
| Diversity of child incomers | 0.31 | 0.13 | 1 | 0.75 | 0.87 | 0.89 | 0.57 |
| Population density | 0.53 | 0.36 | 1 | 2.26 | 2.40 | 2.06 | 2.40 |
| Carstairs deprivation score | 0.85 | 0.87 | 1 | 0.78 | 1.13 | 1.05 | 0.96 |
| Ages 1–4 | |||||||
| % incomers in total population | 0.96 | 0.75 | 1 | 1.00 | 0.99 | 0.95 | 1.00 |
| % incomers in adult population | 0.70 | 0.82 | 1 | 1.07 | 0.99 | 0.96 | 1.03 |
| % incomers in child population | 0.95 | 0.97 | 1 | 1.03 | 0.98 | 1.04 | 1.00 |
| Diversity of total incomers | 0.04 | 0.11 | 1 | 1.14 | 1.01 | 1.24 | 1.13 |
| Diversity of adult incomers | 0.13 | 0.18 | 1 | 1.07 | 1.00 | 1.20 | 1.08 |
| Diversity of child incomers | 0.08 | 0.85 | 1 | 0.78 | 0.76 | 0.84 | 0.86 |
| Population density | 0.29 | 0.26 | 1 | 0.93 | 0.81 | 0.84 | 0.86 |
| Carstairs deprivation score | 0.011 | 0.0014 | 1 | 1.01 | 0.99 | 0.94 | 0.82 |
| Ages 5–14 | |||||||
| % incomers in total population | 0.64 | 0.34 | 1 | 1.01 | 1.11 | 1.02 | 1.09 |
| % incomers in adult population | 0.53 | 0.40 | 1 | 0.95 | 1.06 | 0.97 | 1.07 |
| % incomers in child population | 0.97 | 0.91 | 1 | 1.04 | 1.01 | 0.99 | 1.02 |
| Diversity of total incomers | 0.97 | 0.89 | 1 | 0.94 | 0.95 | 0.94 | 0.97 |
| Diversity of adult incomers | 0.99 | 0.96 | 1 | 0.98 | 1.00 | 0.97 | 1.01 |
| Diversity of child incomers | 1.00 | 0.83 | 1 | 0.97 | 0.97 | 0.95 | 0.97 |
| Population density | 0.87 | 0.99 | 1 | 1.06 | 1.12 | 1.08 | 1.05 |
| Carstairs deprivation score | 0.97 | 0.73 | 1 | 0.96 | 1.00 | 0.95 | 0.97 |
ALL=acute lymphoblastic leukaemia.
For each variable, the reference group is the lowest quintile category (1).
Significance levels from tests for heterogeneity and trend in relative risk between categories are also provided.