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Unit 1 assignment
1.) a.
Who- 728 older men and women from municipal and blood blank registries with plasma total homocysteine concentrations 13 micromol/L or greater, serum and vitamin b12 concentrations 200 pmol/L or greater at screening and no middle ear dysfunction, unilateral hearing loss or pathologic ear conditions unrelated to aging.
What- Years, hearing thresholds high frequencies, low frequencies, folic acid, placebos, males, females, average of the pure-tone air conduction thresholds of both ears (average hearing threshold).
When- September 2000 to December 2004
Where- Netherlands
Why- to determine whether folic acid supplementation slows age-related hearing loss
How- data is collected from the older men and women under a trial that is randomized and controlled.
b.
variable: Year type- Quantitative or Categorical units-Years
variable: High frequencies type- Quantitative units- dB (decibel)
variable: Low frequencies type- Quantitative units- dB (decibel)
variable: average hearing threshold     type-Quantitative units- dB (decibel)
variable: male (municipal) type-categorical
variable: female (municipal) type-categorical
variable: male (blood bank registry)     type-categorical
variable: female (blood bank registry)   type-categorical
variable: folic acid type- Quantitative units- Micrograms
variable: placebo type- Quantitative units- counts (number of placebo pills)
Unit 1 assignment
1.) a.
Who- 728 older men and women from municipal and blood blank registries with plasma total homocysteine concentrations 13 micromol/L or greater, serum and vitamin b12 concentrations 200 pmol/L or greater at screening and no middle ear dysfunction, unilateral hearing loss or pathologic ear conditions unrelated to aging.
What- Years, hearing thresholds high frequencies, low frequencies, folic acid, placebos, males, females, average of the pure-tone air conduction thresholds of both ears (average hearing threshold).
When- September 2000...

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