The conclusions in this type of study may not be valid. This may not be considered a scientific study but merely a survey with plus/minus big deviation.
For example, I can make a similar study of women’s bathrooms, how dirty they are and how it affects them. I then send the white women and the black women similar questionnaires. Based on their answers, I conclude
that black women with dirty bathrooms were more physicially impaired by their dirty bathrooms.
A scientific study would have the researchers look
at the bathrooms to make sure that they are comparing similar bathrooms and look at and measure the impairment to be able to compare both.
Another example is sending a questionnaire to white women and black women and asking how Rock music has affected their hearing.
Let’s say that black women answered that it has affected their hearing severely, would one accept this and make a conclusion. A scientist would measure the degree of hearing impairment in each group to validate. And so on.
The study did not evaluate and look at the actual impairment of each patient to make a comparison.
– Dr.EAM