Questions tagged [statistics]
The statistics tag has no usage guidance.
55
questions
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6 views
Is median or mean more accurate for technical replicates of assay (small n)? [migrated]
If I want to improve the precision of the results of an assay by averaging a few repeat measurements of each sample, when the random error is generally normally distributed but occasional outliers ...
1
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2answers
31 views
As ICD is a global standardization of diseases, is there a global standardization of drugs and if not, why?
I have asked here the question convention about best terms to take 5 htp.
Questions like convention about best terms to take X for humans, might be too narrow, because, theoretically, as more ...
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2answers
40 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
142 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
...
1
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1answer
30 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 ...
1
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1answer
47 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, ...
2
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1answer
59 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
votes
1answer
60 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
47 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 ...
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1answer
20 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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11 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 ...
4
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2answers
163 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 ...
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1answer
116 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 ...
1
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1answer
30 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
76 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 ...
4
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1answer
58 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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0answers
88 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 ...
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. ...
1
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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 ...
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1answer
75 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 ...
3
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0answers
184 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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2answers
254 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 (...
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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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1answer
251 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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0answers
323 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 (...
2
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1answer
89 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 ...
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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?...
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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).
0
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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 ...
3
votes
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 ...
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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 ...
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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 ...
2
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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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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 ...
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1answer
253 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 ...
3
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1answer
421 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
votes
1answer
415 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 ...
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 ...
2
votes
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 ...
6
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1answer
93 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 ...
10
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1answer
303 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 ...
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.
7
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1answer
213 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 ...
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 ...
6
votes
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 ...
11
votes
1answer
253 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 ...
2
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0answers
26 views
Prevalence of anatomical cause for a lateral epicondylitis
I wonder how frequently a lateral epicondylitis has an anatomical cause. When searching for the information, I couldn't find any specific numbers, and the information I read was ranging from "there is ...
