If a participant answered 'yes' to being a current user, but did not provide the duration of years use, she was assigned to be missing for duration.
We categorized history of prostatitis as no, yes, missing and duration of prostatitis symptoms as none, <1 year, >1 year, missing.
Missing travel duration eliminated ≈10% of records from analysis.
From these, 16 were excluded due to missing breastfeeding duration or ethnicity information, leaving 1,783 children in the analysis cohort.
Of the 13,438 participants, the subjects with missing in duration on solid fuel use (n = 65), total amount and lifetime average amount (n = 2,692) were also excluded.
He went missing for the duration of 1998, a period most likely spent in an Al Qaeda training camp in Afghanistan.
Of the 8,561 participants 40 years of age or older who had available ECG measurements, we excluded 194 participants with missing QT interval duration or heart rate, 535 participants with QRS ≥120 ms, and 37 participants with missing data on coffee, tea, or alcohol intake, smoking, or physical activity.
Note: Standard deviation; Acute gastroenteritis; *Information on hospitalization duration missing for one case.
For the remaining patients (40%) exact dates were missing and disease duration could not be calculated.
