Answer:
See the explanation for the answer.
Explanation:
<u>Cohort study for smoking</u>
<u>Outcomes that were examined</u>
1. People at risk of lung cancer due to smoking
2. Influence of outdoor air pollution in lung cancer
3. Variation in tobacco smoking and heavy tobacco smoking was observed.
4. Occupational factors and housing factor were observed.
<u>Cohort study for low vitamin D</u>
<u>Outcomes that were examined</u>
1. People at risk of vitamin D deficiency.
2. Observing value in summer.
3. Correlating vitamin D value with weather and age
4. 25-hydroxy vitamin D was observed.
<u>Cohort study for cold weather</u>
<u>Outcomes that were examined</u>
1. Allergic and asthma risked people were observed.
2. effect on the people when temperature goes up.
3. Observation on the most harsh weather day.
4. Correlating it with age and analysis.
