Incidence rates (per million person-years) and standardized rate ratios (SRRs) of cancer among individuals aged 0–19 years according to cities and counties, Taiwan (1995–2009).

Abbreviations: ASR, Age-standardized incidence rate; CI, confidence interval; SRR, standardized rate (ASR) ratio.
a ASRs were age adjusted to the 2000 world standard population.
b SRR: ASR of the city/county vs. ASR of the remaining area of Taiwan.
+: Significantly higher than for the remaining area of Taiwan, P<0.05.
−: Significantly lower than for the remaining area of Taiwan, P<0.05.
– Indicates that there were fewer than 10 cases, and the statistic is not displayed in order to avoid presenting unstable data.
Census and land data were obtained from the Department of Statistics, Ministry of the Interior, Taiwan [24].
Averaged population densities (persons/km2) and the changes (%) in population densities of the 22 cities/counties during the 15-year study period were also shown.