Questions tagged [statistics]

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17 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
37 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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22 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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30 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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20 views

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
43 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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10 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
34 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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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
43 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 ...
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1answer
44 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
130 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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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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12 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
103 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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1answer
184 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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44 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
100 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
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
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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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
88 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
231 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
31 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
48 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
63 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
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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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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46 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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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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115 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
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
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
151 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
32 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
49 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
71 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
91 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
152 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
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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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 ...
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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
32 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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86 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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1answer
63 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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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 ...