| ZHA Yongru,ZOU Jianming,TAO Zufan.Comparability analysis of data from cohort members between high background radiation areas and control areas of Yangjiang, China[J].Chinese Journal of Radiological Medicine and Protection,1999,19(2):83-86 |
| Comparability analysis of data from cohort members between high background radiation areas and control areas of Yangjiang, China |
| Received:June 07, 1998 Revised:September 10, 1998 |
| DOI： |
| KeyWords:High background radiation Epidemiological survey Comparative analysis |
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| Abstract:: |
| Objective The purpose of the study was to evaluate precisely the results from epidemiological investigation in high background radiation areas (HBRA) and control areas (CA). Methods The constituents for sex and age distributions of cohort members were analyzed using the method of chi square test;the sequences for the first ten causes of death and the first ten site specific cancer mortality rates were analyzed comparatively using the method of rank sum ratio(RSR). Results The results of constituents for sex age distribution among residents in HBRA and CA showed that there was a significant difference (P <0.01),but in age group of 15 64 years,the results showed that there was no significant difference (P >0.05).Among the three dose groups of HBRA,there was no statistically significant difference in age distribution (P >0.05),but there existed a significant difference in sex distribution.The results from comparative analysis of the sequences for the first ten causes of death and the first ten site-specific cancer mortality rates showed that they were almost identical between HBRA and CA,or among the three groups of HBRA (WR=0.9590 0.9879,P <0.05) Conclusione (1)It is necessary and suitable to adjust the results by sex and age for each dose group in HBRA compared with the control group for cancer analysis.(2)The results of the constituent ratios of causes of death and cancer mortality rate showed that there is good comparability between HBRA and CA,or among the dose groups. |
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