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Questions tagged [statistics]

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2answers
37 views

How to evaluate the results of diagnostic studies: how to prove that new method is better than gold standard?

I understand how to evaluate therapeutic studies: basically you compare the results of two groups that were chosen randomly. One group gets the new drug, the other group gets the placebo (or the drug ...
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1answer
140 views

How many people die due to various substance (illegal ones/legal/dangerous ones) per user?

It says 88000 people die from Alcohol related causes What I want to know is the number of people that die compared to the number of alcohol users. Then I want to compare that with the same ratio for ...
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1answer
29 views

Mortality and when a protocol becomes statistically significant [closed]

A study has a placebo given to one group, GROUP P, and a medication given to another group, GROUP M. This medication could be given to prevent colon cancer, anemia, or any other ailment that may ...
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1answer
46 views

Human body density statistics

What are the statistics on the density of our bodies? I.e. Mass/volume with full lungs. Does it follow a normal distribution like height and what is the mean and standard deviation? In particular, ...
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2answers
161 views

How much sleep do adults actually need?

The common consensus is that most adults should get 8 hours of sleep a night. However, sleep needs are highly variable, with some people needing more to function properly, and some gaining little ...
2
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1answer
57 views

How to calculate my “approximate” mortality rate while in ICU?

To make a long story as short as possible for context, I was rushed to the ER while in cardiac arrest back in 2014. Heart stopped beating momentarily and lost oxygen to the part of my brain. None of ...
3
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1answer
57 views

How can someone that is HIV positive not be contagious?

According to https://www.folkhalsomyndigheten.se/nyheter-och-press/nyhetsarkiv/2019/juni/ingen-risk-for-hiv-via-samlag-om-behandlingen-ar-valinstalld/ (In Swedish but I assume there are similar ...
2
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1answer
41 views

What are “powered” vs “unpowered” samples in medical studies?

I'm not a medical (/ medical research) professional, but I know my probability theory and a bit of statistics. When leafing through some meta-study texts (such as this one), I'm encountering use of ...
4
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1answer
57 views

How often do ICD codes reflect the actual diagnosis in EHR?

Electronic health records (EHRs) often contains ICD codes used for billing purpose. Is there any study/survey that looked at how often ICD codes in EHRs reflect the actual diagnosis?
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1answer
19 views

Why are the estimates of obesity prevalence in England wildly different?

I am not a health professional and am a little bit puzzled by this. There appear to be two ranges of obesity prevalence estimates (I am particularly interested in the rate in adults in England): ...
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0answers
10 views

What is the incidence and the prevalence of symptomatic and asymptomatic tendinopathies for the tendons in the buttock, thigh and iliac regions?

What is the incidence and the prevalence of symptomatic and asymptomatic tendinopathies for each tendon in the buttock, thigh and iliac regions? What I have found so far for yearly symptomatic ...
5
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1answer
114 views

Definition of Prevalence

I have been informed that the prevalence of chickenpox and smallpox in the general population are 10% and 0.1%, respectively. On the Wikipedia page it is written Prevalence in epidemiology is the ...
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0answers
179 views

Surgical masks - do they prevent the spread of disease?

Now and then you see something like this when looking at pictures from Japan: There are supposedly many reasons for this, but one is, quoting a summary from Wikipedia: Surgical masks are popularly ...
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1answer
250 views

Awkward: TWINS, but from DIFFERENT DADS? How rare is heteropaternal superfecundation (statistics)?

This is not a Jerry Springer headline -- despite all the sizzling, implicit drama involved -- heteropaternal superfecundation is a fertilization term when a woman is successfully impregnated by ...
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1answer
29 views

How can a significant increase in survival not be interpreted as a significant decrease in mortality?

Link to paper In this paper they explain in their results that they were unable to show a significant link between terlipressin and mortality, however, they were able to show a significant link ...
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0answers
74 views

Is there statistics on self-harm in France?

I'm having a hard time finding statistics related to self-harm in France (number of persons, sex, percentage related to other mental health issues, age,...). I only found a few old press articles with ...
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0answers
37 views

What percentage of the population benefits from getting their ears cleaned by a doctor? [closed]

A doctor can clean the ears of a person. For how many people does this result in better hearing abilities?
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0answers
321 views

Traumatic mydriasis (dilated pupil) information

How and when (if its possible) to say that traumatic mydriasis is going to be healed or stay forever? Is there some specific signs or nobody can say that? Is there any statistic data about it (...
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0answers
87 views

How are Sensitivity/Specificity determined for tests in mental health?

Originally the question was How are Sensitivity/Specificity determined for the first test available for a disease? but I narrowed it down a bit since it seemed to be too broad. Given that measuring ...
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1answer
11 views

gauge R&R of time varying data: how to discriminate between equipment variation and actual signal variation?

I am trying to evaluate a measurement system suitability for some physiological parameters say heart rate. If I collect say 30 measurements of my heart rate, the standard deviation of the population ...
3
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2answers
59 views

Is is common/more likely for hearing-impaired & deaf individuals to have social anxiety disorders & panic attacks? Why or why not?

Is it common/more likely for hearing-impaired & deaf individuals to have social anxiety disorders & panic attacks? As someone born hearing-impaired myself, I know that I am extremely shy and ...
2
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1answer
88 views

How many people have been instantly killed by smoking?

We all know that cigarettes have killed millions of people, to the extent that just about everyone knows someone who has died from it. Smoking deaths are overwhelmingly medium to long term effects of ...
2
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0answers
122 views

Can superficial injury and exercise elevate AST and LDH levels?

Reading the information available here and here, it's stated that both exercise and other injuries can cause elevated results on a couple of indicators commonly used to measure liver function. ...
6
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1answer
92 views

How is it determined that someone died from “air polution”?

I saw this question on another Stack Exchange site, and wondered, how do they even know that one person in China died from "air pollution"? How do these studies that lump millions of people into ...
6
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1answer
99 views

How much are Acute Radiation Syndrome and cancer correlated?

According to Wikipedia, Acute Radiation Syndrom (ARS) results from damage to DNA "other key molecular structures within the cells" I'd like to know how relevant damage of the second kind is. Given ...
2
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1answer
98 views

Are patients with hidradenitis suppurativa overweight due to the disease itself?

After reading about 5 journals on the disease, I noticed they all mention that HS sufferers are usually overweight. They also say that losing weight could mitigate the effects of the disease. I have ...
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1answer
74 views

Which has lower rate of getting pregnant and/or a venereal dicease in condom vs pill?

If you use either a pill or condom to have sex with your partner, what is the probability of getting pregnant and/or getting a venereal dicease in each case? I wonder which is more effective in terms ...
5
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2answers
148 views

The pill and breast cancer

There has been a study (or more than one) that suggest a link between taking oral contraceptives known as the pill and an increased risk of breast cancer. I have tried find to find the study but my ...
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2answers
252 views

Calculate U.S. life expectancy for 2025?

This is the hard data on incidence of specific diseases for the year 1995 and (projected) 2025. I have omitted chronic diseases as a group, although they are projected to increase from 90 million (...
2
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0answers
63 views

Mastocytoma vs Mastocytosis?

My 8-month old son has a mastocytoma developing on his arm (confirmed by his pediatrician). Does this mean he also has mastocytosis? Or are they two separate things? If they are separate, how ...
2
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0answers
15 views

Prevalence rate of thyroid cancer

I am looking for the newest information about the global rate of thyroid cancer. I've searched on WHO website, but it didn't work. Please introduce up-to-date, informative resources. Thank you.
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0answers
14 views

Average Number of Sutures per E.R. visit

I'm trying to gather data for a bioengineering project, but I'm finding difficulty locating the statistic of the average number of sutures per visit, for E.R.'s. Does anyone know how to find this data?...
31
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2answers
849 views

If human life is so long largely due to modern medicine, does every illness shorten lifespan?

One of the most often-cited facts about human life, compared to those of other animals, is that the main reason we live so much longer is modern medicine. Because we can treat illnesses that would ...
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0answers
75 views

Current statistics about lethality of appendicitis

I am currently trying to find recent statistics about the lethality rates of appendicitis and lethality rates of surgeries connected to appendicitis (normal and burst appendicitis).
10
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1answer
296 views

What is the distribution of corrected visual acuity?

While talking with friends about retina displays, resolution of TVs in relation to viewing distance, and so on, I pointed out that not everyone goes periodically to the eye doctor, unless the ...
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1answer
86 views

How many people, on average, floss on a regular basis?

How many people, on average, floss on a regular basis? I feel like I'm the only person who doesn't floss on a regular basis according to my dentist, but do we know the statistics of how many people ...
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0answers
34 views

What percentage of deaths in the U.S. are accompanied by an autopsy?

What percentage of deaths in the US are accompanied by an autopsy? I know that the deceased's relatives must give consent for an autopsy to be performed (if they do not already know the will of the ...
2
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1answer
411 views

What is the significance of white blood cells count to platelets count ratio?

This is actually something I stumbled upon while conducting a statistical analysis. I have WBC and Platelets counts of over 3000 people with varying age and gender. I was thinking about doing a ...
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0answers
27 views

NIPT test results given results of combined test (in pregnancy screenings)

The NIPT test gives a probability of a baby having Down syndrome. Supposedly, this test is more accurate than the combined test. However, I haven't seen any statistics regarding the accuracy of the ...
1
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1answer
61 views

How many never leave the hospital?

I read a statistic in a news report based on a Lancet study that said that an estimated 1.14% of patients who enter a hospital for in-patient surgery never leave the hospital alive. Since there are ...
1
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1answer
251 views

What are “residual” diseases?

In the following extract from mortality statistics is a large entry of 320,065 deaths during the year due to "All other diseases (residual)" from the CDC. Note that it is uncoded whereas all the other ...
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1answer
420 views

Why cancer is almost twice as likely in more developed countries compared with less developed countries?

I have looked at the statistics for cancer and it shows that cancer is 1.8 times higher in more developed countries compared with less developed countries - which to me is counter-intuitive (air ...
4
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1answer
2k views

Number of MRI scanners in the world today?

How many MRI scanners are there today in the whole world? My own search only revealed numbers in certain countries but no overall count.
2
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1answer
129 views

Are there any studies on health effects of smoking once a month or less?

Are there any studies on health effects of smoking once a month or less? There's very little out there on very rare smokers, and as such I've been unable to find any studies along these lines for ...
2
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0answers
105 views

Are there any studies on health effects of pipe smoking once a week or less?

Are there any studies on health effects of pipe smoking once a week or less? There's very little out there on rare pipe smokers, and as such I've been unable to find any studies along these lines for ...
4
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1answer
71 views

What is the genetic vs non-genetic contribution to lifespan?

I am looking for any studies that involved twins that would show how much lifespan can be increased by living healthily, and how much it depends on lifestyle rather than genetics.
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1answer
212 views

Cancer development probability with age

What is the relation between age and cancer development probability? I have heard that cancer is rather rare at younger age groups. Assuming it increases with age, is there a peak after which the ...
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1answer
250 views

Lifetime cancer risk for people with healthy lifestyle

According to this, lifetime cancer risk for males is about 43% and females 38%. There are many factors that increase cancer risk, like: smoking drinking alcohol obesity lack of physical activity ...
2
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0answers
65 views

What are the most common causes of death in the profession of computer programming?

Some cancers such as colorectal cancer are said to be associated with sitting too much. I spent most of the day sitting down. While I could remind myself to stand up more regularly, I was wondering ...
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1answer
325 views

Statistics of knotted-cord related death and variables of its formation

I am researching the effects of knotted cord and its possible causation or correlation with causing infant-death. With online research I am finding that 1%-2% of babies are born with a true knot, ...