MICA is a cross-sectional study based on a stratified sample of children using two strata: children with asthma and children without asthma, selected in an approximately 1 1 ratio.
Heart rate is not retained in Goldstein set of criteria, but it uses six different strata of age to define normal blood pressure.
Controls were identified through list-assisted random-digit dialing (RDD) and were frequency matched to cases according to age at diagnosis using 3 age strata (0 1, 2 3, and ≥ 4 years) and geographic region of residence using five location strata (four U.S. Census regions plus Canada).
Moreover, Proulx set of criteria uses two age strata (less than 1 year old or more than 1 year old) to define low blood pressure, bradycardia and tachycardia.
Log-rank test was used to compare the survival pattern between the two strata of study variables.
Schaffer collateral synaptic pathways were stimulated using two bipolar tungsten electrodes placed in stratum radiatum of the CA1 region, one towards CA3 and the other towards the subiculum.
Outside Worcester City, strata were created by combining contiguous towns using two criteria: a) similarity among towns in terms of vulnerability rating [H,A] (so the strata achieve reasonably optimal relative homogeneity), and b) aggregation obeys the MOS rule.
The stratum corneum was removed using fifteen pieces of tape (Scotch 750, 3M), and the remaining KA was evaluated using solvent extraction.
However, there are two strata of staff performing the same role – those employed by Tate itself, and agency staff.
Allocation was carried out using stratified randomization with seven strata of companies or communities in the first period, five strata in the second period, and three strata in the third period.
