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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

From: Buccal mucosa micronuclei counts in relation to exposure to low dose-rate radiation from the Chornobyl nuclear accident and other medical and occupational radiation exposures

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)