Adjusteda incidence rate ratios for primary brain tumour in association with a 100 Bq/m3 increase in domestic radonb within strata of NOx at the residential address.

aWe adjusted the analyses for age (underlying time scale), sex, employment in the chemical industry for at least one year and consumption of fruit and vegetables.bRadon exposure was entered as a continuous variable in all models as the time-weighted average concentration at residences from 1. January 1971 until censoring.with inclusion of a 10 year latency period.cTest of the null hypothesis that the linear trends are identical, for Wald test for interaction.dTime-weighted average concentration for NOx.a. 我们针对年龄（潜在时间尺度）、性别、至少1年化工行业从业经历以及果蔬摄入量对分析进行了校正。 b. 所有模型均将氡（Radon）暴露以连续变量形式纳入，采用1971年1月1日至删失时点的住宅时间加权平均浓度，并纳入10年潜伏期。 c. 针对交互作用的沃尔德检验（Wald test），用于检验"线性趋势一致"的原假设。 d. 氮氧化物（NOx）的时间加权平均浓度。