Patients with concomitant carcinoma in situ (CIS) or a short term follow-up period (less than 6 months), and those that underwent radical cystectomy or for whom there was incomplete data collection, were excluded to make the study population more homogeneous.
Studies that had early childhood (beyond birth) as the first period of data collection were excluded.
Women who were pregnant for the first time at the time of the data collection were excluded.
Participants who died prior to or during the 2006 2010 data collection were excluded from the imputation process.
It must be noted, however, that students absent from class at the time of data collection were excluded as the study setting was a class room.
Thirty-one women who did not wish to conceive again and twenty women who were pregnant at the time of data collection were excluded from analysis.
Children who were no longer enrolled in the preschool by the start of the data collection were excluded from the study.
Study members who were known to have died prior to or during the age 60- to 64-year data collection were excluded from the multiple imputation analysis.
To match the age of the glaucoma patients all subjects younger than 50 years of age at the time for the data collection were excluded.
Firstly individuals admitted to the level 1 care ward from level 2 or 3 wards and those with inadequate data collection were excluded from analysis.
