Comparison of the present data with international caries data for preschool children must take account of methodological differences such as use of national survey data versus sub-samples, differing age ranges, ECC definitions and examination criteria.
To allow comparisons across the differing age ranges of the four study populations, age and sex specific z-scores were created using the WHO Child Growth Standards 2007 [31].
Differing age ranges in turn affected the mean ages of recruited children.
This same information is essential to risk assessments and meta-analyses because they pool results across epidemiological studies that consider populations of differing age ranges, sex, or races.
While the concordance index was very heterogeneous between studies, principally because of differing age ranges, the increments in the concordance index from adding log C-reactive protein to conventional risk factors were more homogeneous.
However, study participants and nonparticipants did not differ in age range, job type, years of healthcare experience, or overall subjective impact of SARS on their lives (Table 2).
The recruitment procedures and the target populations differed (regarding age range), which makes it difficult to compare for instance the motivation for IPT.
Considering the relevance of this problem, Matsudo and colleagues interviewed 2001 individuals aged 14 77 in 29 cities within the state of Sao Paulo and showed that the levels of physical activity did not differ among age ranges.
Our study is cross-sectional, and it is possible that other factors differing across the age range affected metacognitive ability.
Seventeen healthy control subjects, who did not differ in their age range or gender distribution from the subjects with rheumatoid arthritis, were recruited through advertisements in the greater Boston area.
