Questions tagged [statistics]
The statistics tag has no usage guidance.
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What are the pitfalls using the standard vaccine effectiveness calculation process if applied to reinfectivity observations?
Phase 3 clinical trials for Covid-19 vaccines have been completed, and the "effectiveness" values have been made available. The trials involved a placebo arm, such that if the vaccine were ...
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Generally the FDA tends to deny new drug applications when P is above .00what? Anyone have stats on this?
Generally the FDA tends to deny new drug applications (NDAs) when P is above .00what? n is below what? And is it a function of p? Anyone have stats on this? Surely there are research groups ...
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What does it mean for a vaccine to be “90% effective”? [duplicate]
It seems like a stupid question: does it "just" mean that 90% of the population won't be infected? But if only 10% of the population would have been infected without the vaccine, then it's ...
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2answers
790 views
BNT162b2 mRNA Covid-19 Vaccine efficacy after 1st dose - explain the statistics
Pfizer's paper (Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine) published recently states the following in the Efficacy subsection of the Results section:
Between the first dose and the ...
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0answers
25 views
Why the mismatch between the EUROMOMO mortality rate and 'COVID-19 second wave' positive tests and hospitalizations?
Currently (September/October 2020) there is a large increase in the percentage of COVID-19 tests that come out positive, at least in several countries in Europe. And, at least in the Netherlands, ...
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2answers
47 views
How did WHO estimate the number of suspected worldwide COVID-19 cases?
A couple of days ago World Health Organization said that around 780 million people worldwide (or one in ten people worldwide) are suspected to have had COVID-19. (One in 10 worldwide may have had ...
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0answers
26 views
What is the statistical power required for COVID-19 vaccine trials?
Clinical research selects the number of subjects under treatment based on desired statistical power (i.e. the probability of rejecting the null hypothesis when the null is in effect false, given a ...
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0answers
33 views
What specific factors give rise to the mortality rates depending on cancer type?
In my experience it is commonly communicated that certain types of cancer have a higher rate of mortality than others. For instance1, pancreatic cancer has a very poor prognosis while the prognosis ...
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0answers
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Are there already statistics about the spread of common viral diseases in the Covid-19 pandemic era?
Are there already public statistics regarding the spread of other viral diseases since the beginning of the Covid-19 pandemic, and the application of mandatory protection rules (e.g. protection masks, ...
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1answer
45 views
How many of those exposed to COVID-19 get infected?
Statistically, from 100 people exposed to the coronavirus that causes COVID-19, how many get infected?
Say for example in the USA.
Since they talk about exposed people, then such cases should be ...
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11 views
How risk is related to PM2.5 level
Some areas are currently experiencing health warnings to stay inside due to poor air quality caused by smoke from wildfires causing high PM2.5 levels. How does the health risk depend on the PM2.5 ...
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1answer
35 views
Why is the lifetime prevalence of depression lower than the point prevalence? Figures from a study
From an article titled "Prevalence of Depression in the Community from 30 Countries between 1994 and 2014 (Lim et al., Scientific Reports, 2018)":
A random-effects model meta-analysis that ...
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0answers
18 views
Is there solid data whether abandoning information technology in healthcare increases adverse events or errors made?
Hello fellow scientists,
I work in a hospital where a lot of processes are digitalized (e.g., electronic health records, QR-code assisted workflow for prescribing medication etc.). I am looking for ...
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1answer
47 views
The placebo effect [closed]
Is it possible to eliminate the groups of placebos in all those clinical trials that have a precision medicine nature? Since if it is precision medicine, it is supposed to cure 100% of those affected ...
4
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1answer
45 views
How sophisticated were efforts to track the spread of past pandemics for public information?
I am currently inquiring into the COVID Tracking Project for a first-year university course. I would like to give some historical context, i.e. past attempts at pandemic tracking.
Searching the web ...
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1answer
348 views
Total number of deaths in the USA before COVID-19 and in 2020?
I would like to compare before and after COVID-19. I want to know if there was a raise, how high, and if there was a shift from other causes to COVID-19.
The media is very biased and only reports the ...
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0answers
77 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
36 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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13 views
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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2answers
106 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?
2
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1answer
186 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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51 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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14 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 ...
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2answers
103 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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1answer
38 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
48 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://...
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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
90 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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0answers
48 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
232 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
37 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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1answer
52 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 ...
2
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1answer
72 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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0answers
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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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0answers
26 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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47 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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0answers
17 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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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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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
45 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
43 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
152 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
33 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
50 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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1answer
72 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
105 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
189 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
23 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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2answers
173 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 ...
5
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1answer
119 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 ...
