Representativeness of the survey sample for gender, age, profession and double stratification by geographical area and community size as compared to the French general population was ensured by the use of the method of quotas [ 7], based on the statistics of the French Employment Survey conducted in 2002 by the French National Institute for Statistics and Economical Studies INSEEE).
Given the rather low prevalence rate of most pediatric chronic conditions, we did not have the sample size to match samples for age, gender, race/ethnicity, and SES.
In the final, 7th imputation step, 474 missing values of FISH were imputed in Dataset 1, using complete input samples for age, gender, urine cytology and Cxbladder Detect from Datasets 1, 4 and 5.
The incremental costs, incremental QALYs gained, and the ICERs and their 95% confidence intervals were calculated from a Monte Carlo simulation using 10,000 samples for each gender and age stratum.
The data descends from a population-representative German sample controlled for gender and education (N = 1509).
An ANCOVA analysis was conducted to examine the impact of subtype in the ADHD sample, covarying for gender.
The interval censored survival times have been compared (log-rank two sample test) for gender and WB.
Table 1 gives an overview of the socio-demographic characteristics of the study sample stratified for gender as well as the results of the bivariate logistic regression analysis using gender as the dependent variable.
19.4% of the 723 screened were identified as being 'at risk' and this 'at risk' group were interviewed along with a comparison sample matched for gender, school and school year.
The preliminary multinomial regression models described above employed list-wise deletion, and hence sample sizes varied from the full sample of 7218 for gender to samples of down to 4000 for some of the less complete measures.
