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For comparison, we matched each participant with a positive screen or a SIF to a negative screen control based on date of screen, screen type (LDCT, CXR), site of accrual, sex, and 5-year age caliper.
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The design of this study, with concurrent selection of controls and matching by hospital ward and date of screening, provides a more accurate estimation of relative risks for CPKP colonization than previous investigations.
The average interval from date of screening to enrollment was 18 days, ranging from 6 42 days.
Person-years were calculated from date of screening to date of death, date of embarkation or the end of 2009 as appropriate.
Date of screening and date of diagnosis were used to calculate the interval between screening and diagnosis.
The date of screening varied between 24 November 1998 and 28 April 2015.
Demographic and reproductive data were directly surveyed by purpose-trained staff at the date of screening.
Data from the booking system (civil registration number, screening round, date of invitation, date of screening, and date of sending the screening result to the woman) in each of the five Danish regions are transferred electronically to the DKMS.
The screening data included the registration number of the dog, date of screening and the screening result (NCD).
General hospital admissions (SMR1) and mental health admissions (SMR4) were obtained from the date of screening to the end of 2009.
Follow-up was from the date of screening to the date of death, date of embarkation, or 31 December 2007 (median 29 years, maximum 42 years).
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