14 The low serum concentrations of TSH result in clear, age-dependent declines in serum total and FT3 levels, whereas the reduction of both T4 secretion and peripheral T4 degradation of thyroxine results in no change in serum total and FT4 concentrations.
In contrast to this, prevalence rates from 22 to 30%% in adults without clear age pattern were found in a representative Canadian sample [ 17].
Although the event rates were similar across the three age ranges studied in women, there was a clear age gradient in men, with significantly higher event rates in men over the age of 64 (χ test for trend: P=0.022 for women, P<0.001 for men).
In the past, a clear age trend has been documented for physical health measures, while the mental health measures have shown to be less sensitive to the age effect [ 13, 16, 17].
We found no clear age trend in counselling rates in our cohort and this may be due to overall small numbers who received counselling.
Although there are clear age differences in youth's exposure to community violence, the impact of gender is less clear.
In our setting, NO2 correlated with increasing respiratory symptoms mostly in summer but without a clear age dependence.
Men in the youngest age strata had lower serum concentrations than older men, but there were no clear age differences in women.
Data from some US population health surveys also did not find a clear age gradient in self-reported general health [ 32, 33].
There is no clear age group difference in the drinking water As exposure.
In Sweden, there are clear, age-related differences in HbA1c results among young people with diabetes.
