Questions tagged [statistics]

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39 views

Why does the world-wide COVID-19 death rate appear to be constant?

Total confirmed COVID-19 deaths per million people One would normally expect the total deaths to be growing exponentially (going viral) or to be damping down and approaching a constant (zero new ...
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1answer
34 views

What does it mean, that an epidemic curve is truncated at the level of diagnostic efficiency?

Recently I've heard in one interview with a Professor of Epidemiology, that in my country the epidemic curve of COVID-19 is not flattened (contrary to popular opinion), but rather is truncated at the ...
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Confusion regarding death rate of covid19? 2% 0r 12%? [duplicate]

Worldometer is a popular website It mentions percentage of critical cases as 2% It also mentions that in closed cases, 12% cases resulted in death So what is to be considered death rate? 2% or 12?
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84 views

Why is the reported number of COVID-19 deaths lower on Sundays and Mondays in the US?

I was looking at the Daily Deaths from COVID-19 from Worldometers and I noticed that the number is always lower on Sundays and Mondays. Why is that? Am I interpreting the graphs correctly?
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357 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
37 views

Does any country have Covid-19 death (or infection) statistics by occupation?

I know this only marginally on-topic, but besides healthcare workers, I'd guess workers who meet a lot of people daily are also at high risk. There have been some reports in the US of supermarket ...
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1answer
159 views

Why has covid-19 death rate reduce over the months?

I have been following the COVID-19 news for quite some time now and there is this one thing which is just bugging my head. When I first started seeing the statistics, the death rate was at around 15% ...
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27 views

Can the specificity of a COVID-19 antibody test be improved by testing twice?

My question is fairly simple: There is a COVID-19 antibody test with a worst-case specificity of 98%, meaning that it yields potentially up to 2% false positives. While that number is not bad it is ...
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9 views

What are the current statics of the flu globally since december 2019 until today?

I can only find the current statics for the US that says "Between 36 million and 51 million people have been stricken with the flu as of March 7, according to the latest CDC data." link: https://www....
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2answers
89 views

Is the day-of-week variance in COVID-19 case numbers a well-established phenomenon?

Right now (April 27), the JHU data on new COVID-19 cases in the US show a very distinct weekly rhythm; reports are lowest on the weekends and peak in mid-week. This isn't at all surprising — any ...
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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 ...
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1answer
43 views

What is the sensitivity / specificity of a symptom?

I know the two terms in the context of a classification problem: A classification algorithms sensitivity/specificity is defined as sensitivity = TP / (TP + FN) specificity = TN / (TN + FP) I like ...
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1answer
51 views

Are confirmed US deaths being posted anywhere?

The CDC website on cases and mortality involving COVID-19 currently says reads "Data include both confirmed and presumptive positive cases of COVID-19. Is there anywhere that they are breaking this ...
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1answer
45 views

What are the current statistics of the flu globally since December 2019 until today?

I can only find the current statistics for the US that says "Between 36 million and 51 million people have been stricken with the flu as of March 7, according to the latest CDC data." Source: https://...
2
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2answers
83 views

Why does the CDC say there are an order of magnitude more COVID-19 deaths than COVID-19+Pneumonia?

The CDC has a webpage that lists "Table 1. Deaths involving coronavirus disease 2019 (COVID-19) and pneumonia reported to NCHS by week ending date, United States. Week ending 2/1/2020 to 4/4/2020.*" ...
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45 views

Why is the COVID-19 death rate so high in San Marino?

San Marino has a COVID-19 death rate of 943 per million population (third column from left): — Coronavirus Update (Live): 1,256,358 Cases and 68,229 Deaths from COVID-19 Virus Outbreak - Worldometer (...
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3answers
219 views

Is there any significance in reporting COVID-19 cases by population?

Many news outlets are reporting total COVID-19 cases by country and then comparing them to other countries. For example, comparing the total cases in the United States vs the total cases in China. As ...
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1answer
28 views

What is Mortality displacement?

I just read a German article comparing influenza with COVID-19. There is a table with Mortality displacement (rates? cases?) and laboratory-confirmed cases of influenza. I'm super confused by this ...
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18 views

how do you estimate the mortality rate of the corona virus? [duplicate]

Disclaimer: I initially posted this question on math.stackexchange.com, but a user there suggested I should post it here instead. I've seen mortality rates for the coronavirus reported for different ...
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23 views

Where can I get longitudinal data of the COVID-19 cases?

Where can I download a full dataset of the SARS-CoV-2 pandemics containing time information for each individual (date of infection, date of death, age, gender, weight, censoring information...) It's ...
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43 views

Why Covid-19 might end until September-October in Mexico?

This link was published ~8 hours ago https://www.razon.com.mx/mexico/epidemia-septiembre-pico-agosto/ (spanish) mention this The Undersecretary of Prevention and Health Promotion, Hugo López-Gatell,...
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16 views

How does Incubation time distort statistics?

It takes 7 days on average for the coronavirus to show symptoms. A person is contagious during that time. Should we be correcting the statistic like this for real number of cases? In the above graph ...
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112 views

Why are there so few Covid-19 critical cases in South Korea?

According to Covid-19 statistics there are currently 3150 people affected by Covid-19 in South Korea, while critical cases + death are 27 i.e. less the 1% of the infected. However, on Diamond Princess,...
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23 views

What are the recurrence rates for posterior shoulder dislocation?

I know many publication which report recurrence rates for anterior shoulder dislocations, but couldn't find any study that reports recurrence rates specifically for posterior shoulder dislocations. So,...
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2answers
42 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
41 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
150 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
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 ...
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1answer
48 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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168 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
66 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 ...
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1answer
85 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 ...
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1answer
117 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
61 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
22 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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1answer
117 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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1answer
270 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
31 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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85 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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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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335 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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90 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 ...
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2answers
60 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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1answer
102 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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128 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. ...
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1answer
99 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 ...
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1answer
101 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 ...
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1answer
99 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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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 ...