To minimize confounding of biomarker associations with ARDS by clinical variables, such as severity of illness, cases and controls were one-to-one matched for severity of illness (APACHE II, within one point), age (within 10 years), gender (one-to-one match) and number of non-pulmonary organ failures (within one).
As each cohort consisted of individuals in a five year age group (i.e. 45-49, 55-59, 55-59 yeand and so on) it was appropriate to calculate attrition of the cohort at 5-yearly intervals so the number of individuals within the cohort who progress from one age group to the next could be determined.
It too sounds a fine idea, but even top private schools, with lots of money and good teachers, find it tricky to timetable lots of variation within one age-group's lessons.
We matched controls to cases on age (within one year), sex, and duration in cohort (follow-up 30 days either way).
Cases and controls were matched on age (within one year), race (non-Hispanic white, Hispanic, Black, Asian), calendar year of diagnosis (exact year), Kaiser Permanente pathology department of origin, and treatment of index breast cancer with tamoxifen (yes, no).
Research on the response to LPS in human monocytes and dendritic cells confirmed an increase in the TLR signaling response with age as responsiveness of infants increased over time reaching adult levels within one year of age [ 18].
Normal maturers were those with a skeletal age within one year of their chronological age.
This was done by selecting appropriate matched controls within one month of age for each HIVe case.
In fact, most infants who develop hip dislocation show several signs of joint laxity or subluxation at birth, or within one month of age.
