Table 7 Optimal variable set, minimizing Akaike Information Criterion (AIC), fitted to data excluding any cancers (radtx ≠1 AND chemotx ≠1 AND Case_leuk = 0)(6 persons excluded) or in complete database. In either case variables are shown in order of selection into the final optimal model
Variable | Description |
|---|---|
All cases | |
rad_radiography | study subject ever worked with radiation as industrial radiographer (other than time study subject spent in the Chornobyl area) |
x_other | Has the interviewee ever had other (than bone, chest, dental) X-ray examination? |
chemotx | Has study subject had chemotherapy for cancer tumour |
flag2 | controls used in risk analysis for Phase I but now matched to their original case used in set Phase II |
COM1_EXP1 | dosimetry expert’s opinion about the quality of interview during the 1st mission to the 30-km zone |
[age at buccal sampling]7 | polynomial completed to include all lower order terms - [age at buccal sampling]k with k < 7 |
exp | expert dosimetrist who prepared dosimetric questionnaire for input into RADRUE |
y_int | year of interview |
rad_army | study subject ever worked with radiation in army service (other than time the study subject spent in the Chornobyl area) |
haz_exp | study subject ever worked in a hazardous industry (specific types of chemical/electrical/road-building/other) |
haz_el | study subject worked in electrical industry (hazardous industry) |
x_dental_n | number of times study subject had dental X-ray |
num_miss | number of missions to the Chornobyl exclusion zone |
haz_road | study subject ever worked in road-building industry (hazardous industry) |
sm_pday | How many cigarettes did interviewee smoke in a typical day? |
x_bone | Has interviewee ever had bone X-ray? |
Excluding 6 cancer cases | |
x_other_n | How many times interviewee had any other type (than bone, chest, dental) of X-ray examination? |
rad_army | study subject ever worked with radiation in army service (other than time the study subject spent in the Chornobyl area) |
COM1_EXP1 | dosimetry expert’s opinion about the quality of interview during the 1st mission to the 30-km zone |
[age at buccal sampling]5 | polynomial completed to include all lower order terms - [age at buccal sampling]k with k < 5 |
exp | expert dosimetrist who prepared dosimetric questionnaire for input into RADRUE |
x_dental_n | Number of times study subject had dental X-ray |
x_bone | Has interviewee ever had bone X-ray? |
industry | work in hazardous industries |
sm_pday | How many cigarettes did interviewee smoke in a typical day? |
num_miss | number of missions to the Chornobyl exclusion zone |
haz_road | study subject ever worked in road-building industry (hazardous industry) |
rad_radiography | study subject ever worked with radiation as industrial radiographer (other than time study subject spent in the Chornobyl area) |
other_chemical | work with hazardous chemicals other than in petroleum industry/pesticides/solvents |
flag_definite | certainty in the leukemia diagnosis (definite + probable/other) |
haz_chem | Study subject worked in chemical industry/oil industry (hazardous industry) |