When the stratification module was applied to the high school data, the 65 schools were partitioned into L = 12 distinct groups with 2, 2, 3, 6, 9, 10, 10, 5, 7, 5, 3, and 3 schools assigned to each respective efficiency stratum (see Table 2).
Severity scores for each of the five WHO age strata are assigned to each sequela; the severity of the disease or condition may vary depending on age.
We used the sample weight assigned to each survey respondent, accounting for the probability of selection, as well as adjustment for nonresponse by sample strata.
The remaining women will be assigned to Stratum #1 or Stratum #2 of the study and will be randomized with respect to iron supplement prescription.
The pregnant women are assigned to Stratum #1 or Stratum #2 as a function of the hemoglobin values in the baseline analysis of the study.
The coders agreed on the assignment of definitive maltreatment codes for 77.4% of cases assigned to this stratum by the auditor, agreed on the assignment of possible maltreatment codes for 87.4%, and agreed on the assignment of unintentional injury codes for 94.8% of cases.
Every FIA ground plot is assigned to a stratum of which a weight is based on its proportion within the estimation unit.
Twenty-nine cases (32.9%) were assigned to risk stratum 1, 41 (46.6%) to risk stratum 2, and 18 (20.5%) to risk stratum 3. The characteristics of the cases and control subjects are summarized in table 2. The pneumococcal vaccination rate was significantly lower in cases than in control subjects (38.6% vs 59.1%; p = 0.002).
Each report is assigned to a country year stratum, based on the country of origin of the report and the date of the event.
