# Questions tagged [incidence-rate-ratio]

The tag has no usage guidance.

94 questions
Filter by
Sorted by
Tagged with
17 views

### getting incidence rates from IRR using zero-inflated poisson regression

my data looks like this: and so i used zero-inflated poisson regression model to model events (e.g., hospitalization for a specific condition). ...
1 vote
72 views

### Incidence rates from manual calculation differs from that obtained from the estimated marginal means of a poisson regression

Poisson Regression I have done a poisson regression where the data is individual-level data, the dependent variable, event is 1 if individual had the event or 0 if ...
• 227
34 views

### Obtaining Incidence of death per X person years from KM survival curve?

Say I have interval censoring in my data and have derived KM curves for two groups with maximum follow up of 2 years. Death is the outcome of interest. For each group, how do I obtain number of death ...
• 855
1 vote
47 views

### Interpretation of incidence rate ratio

The incidence rate ratio (and 95% confidence interval) of rotavirus gastroenteritis for the vaccine group compared to the placebo group is $0.67 (0.55, 0.82)$. I want to know approximately how many ...
1 vote
25 views

### Converting confidence interval to SE for Ln(rate ratio)

I have the following a data for a medical meta-analysis. The data is given as an annualized flare rate for the drug and placebo, and then the rate ratio (0.67) is presented with a confidence interval. ...
• 21
1 vote
37 views

### Prevalence / Incidence and Relative Risk

I'm doing a course in biostatistics and I came across this question to solve: "Consider a two-year follow-up study of the association between a measure of stress (dichotomised into two levels: ...
88 views

### Survival analysis vs Cumulative incidence vc Incidence rate for cohort with varying baseline dates

Research question: I am interested in analyzing in R whether people with a specific level (out of four levels) of a blood parameter BP have a higher risk for developing a specific disease D. A ...
• 23
39 views

### What is the test performed in this table?

Yesterday I was helping a friend in reviewing a clinical psychometric paper for his Bachelor's thesis. There, there is this table presented: Now, the paper states that (the emphasis is mine): "...
1 vote
11 views

### Calculating a Wald CI for a mean of model parameters, or reparametrise model?

I am working with a PI who strongly wants to compare his results to a paper I find methodically confusing, if simple. The goal is to calculate weekly rates and adjusted rate ratios from a multi-year ...
• 21
103 views

### What are the comparative advantages and disadvantages of interpreting regression output using marginal effects vs. ratios?

In models with a discrete dependent variable and/or linear models with non-linear right-hand specifications (interactions, polynomials, etc.), interpreting the association between Y and BX becomes ...
273 views

### Relationship of incidence rate and hazard function

I like to figure out how I can retrieve an incidence rate based on a hazard function. So background could be that my hazard function models the prob of the event based on the age of a person (t = time ...
• 3
1 vote
179 views

### Incidence risk vs -recalculated incidence risk from incidence rates

I am learning epidemiology and am puzzled with the following issue. Assume we have a prospective cohort study with the following results: 1000 participants alive at baseline (N) 12 years of follow-up ...
• 540
107 views

### Comparing two groups of incidence rates

Thank you for your time with this question. I'm trying to answer whether an exposure is correlated to incidence of disease. I have a group of 100 counties in California, and I have the incidence of ...
3k views

### Is there a difference between rate ratios and hazard ratios?

In Epidemiology, an incidence rate ratio is the ratio between the incidence rate in the exposed and the incidence rate in the unexposed, where an incidence rate is the number of events divided by the ...
• 137
1 vote
166 views

### Subgroup analysis results are different if I conducted each subgroup separately in metarate in R

I am doing a single arm meta-analysis of incidence rate using Poisson regression and doing subgroup analysis using meta and ...
154 views

### Test for incidence-rate trend in Stata

I am using Stata 17.0 MB and working on a dataset of Enterococci bacteria infections in the previous ten years (2012–2021). These bacteria have more dangerous subtypes resistant to one antibiotic (...
2k views

### Advantage of Poisson model over Cox PH model for analyzing first event?

For analysis of the first event, I am wondering if Poisson model has any advantage over Cox model, besides some people find rate ratio easier to interpret than hazard ratio? I notice some people use ...
• 743
2k views

### What should we report in our manuscript for negative binomial regression, IRR or OR?

I have applied negative binomial regression analysis for my data in SPSS. However I am not sure what do I have to report. Is it called IRR and CI or odds ratio (OR) and CI like in logistic regression. ...
173 views

### Can Marginal effects and Incidence Rate Ratios be exactly the same?

Consider a boring count data model of citations of an article in relation to its page number and the price of the journal. I prefer an ordinary negative binomial regression. Can it be that the ...
• 419
89 views

### Comparing multiple incidence rates of disease

I have a set of data of patients from different places who have had the same operation to remove their appendix. A small subset of the these patients have come back with cancer in the appendix. I ...
1 vote
4k views

### Calculation of 95% Confidence Interval for an Incidence Rate Difference

Suppose that I have two pre-computed Incidence Rates with 95% CI, calculated from the same sample. Let's say IR1: 10.0% [8.0-12.0%] IR2: 21.0% [15.0-27.0%]. If I want to calculate an IR difference, ...
• 686
68 views

### Network Meta-analysis with poisson regression

I recently got interested in evidence sinthesis and, while studying, a little doubt came up to my mind: Is it possible to do Network Meta-analysis using poisson regressions? Also, is it possible to ...
1k views

### Derivation of confidence interval of incidence rate ratio

I am trying to understand the confidence interval equation for a Incidence Rate Ratio (IRR) given several places: $95\text{% CL(IRR)} = \exp(\log(\text{IRR}) \pm 1.96\times \text{SE(log(IRR))})$, ...
• 103
348 views

### Conway-Maxwell-Poisson (CMP) - Coefficient interpretation (Log/IRR)

I'm using the Conway-Maxwell-Poisson (CMP) distribution to model the amount of nouns in a clause (data is under-dispersed). I've run the model using glmmTMB (family= "compois") but I'm ...
• 63
35 views

### How to estimate prevalence with a zero incidence (rare disease)? [duplicate]

I had to solve the following problem. Newborn screening has been implemented for a very rare pathology. For 6 months, and out of 50,000 births observed, no sick case was observed. What is the ...
1k views

### Incidence rate ratio after negative binomial results in R

I am trying to calculate the incidence rate ratio of my negative binomial model. After running my negative binomial regression model, I use exp(Mymodel) in order to ...
• 73
3k views

### Calculation of the Confidence Interval for Incidence Rate Ratio using Exact Approach

I have incidence rate ratio equal to 0.04: If I am not mistaken, normal computation of CI is: ...
• 95
1k views

### Are there any difference between irr (Incidence Rate Ratio) and exp (beta) coefficient?

I am wondering that are there any difference between IRR (Incidence Rate Ratio) and the exp(beta) coefficient?
79 views

### Standard incidence rate

I am conducting a meta-analysis where I pool standard incidence ratio's. Several of the studies do not give the SIR between the groups I would like to compare but do give the SIR relative to another ...
• 21
2k views

### Determining the statistical significance of change in incidence rates

What is the approach to use to determine the statistical significance of change in incidence rate over years? Below is at table showing such kind of data of incidence rate per 1000. ...
1 vote
462 views

### Zero-Inflated Negative Binomial Theta and Incident Rate Ratios (IRR)?

I am trying to determine the best regression model for data with many zeros; I have about 200 with non-zero DS scores and 600 with zero DS scores. ...
1 vote
23 views

### Is there a way to compare incidences of 2 diseases in the same cohort?

I would like to compare incidences of 2 diseases in the same cohort for the past 10 years. Eg. I want to see whether there's an association between incidence of heart disease and incidence of ...
• 11
2k views

...
• 131
161 views

### Meta-analysis with random effects on prevalence data with > 2 possible outcomes: is it necessary that the weighted prevalences all add up to 100?

I am running a meta analysis on prevalence data. Participants can belong to one of four groups. Each study produces the percentage of participants that belong to each group (e.g., Group A: 50%; Group ...
• 2,651
34 views

### Which statistical analysis model to use to calculate the relationship between diabetes incidence and endothelial function?

I have longitudinal data with 2 follow ups at year 1 and 3. At baseline we have measure of endothelial function and we want to calculate the relation ship between endothelial function and diabetes ...
1 vote
484 views

### What is the difference between 1-year partial prevalence and annual incidence?

In cancer research, like in this article, partial prevalence is sometimes used to assess the epidemiological state of a disease in a population. The document I'm trying to understand (link, in french) ...
• 1,440
1 vote
519 views

### How to model counts of a categorical variable?

I'm interested in assessing the impact of various covariates (age, sex, Charlson comorbidity score, etc.) on the incidence rate of a pulmonary event. However, the event is not binary. Each patient ...
• 51
102 views

### comparing incidence rate

I have a data set of individual level data for the outcome in question. I also have aggregated data (at a national level) from which I'm obtaining the denominator. Using this information, I've ...
1 vote
18 views

### Test for yield and disease incidence in block design

I need to analyse a set of data coming from an agricultural experiment, with the intention of assessing the incidence of a certain disease in potatoes under three different treatments (plus blank). I'...
171 views

### Calculate incidence rate per person or in total

For my study I am doubting about the following: First I want to present the incidence rate for patients who received an CT-scan. I thought I would just count all the CT-scans that took place and ...
• 21
18k views

### what is x per 100 person years mean?

In medical papers, it is very common to calculate incidence rate and mention it's unit as per 100 person years. What does this means? I know that incidence rate is the amount of people got the event ...
• 232
1 vote
98 views

### Confidence intervals for Ratios of Correlated (nested) Age-Adjusted Rates

I am interested in calculating the incidence of disease in an ethnic subpopulation (denoted $X$) and comparing this with the incidence in the entire population ($\Omega$) (where $X$ is a true subset ...
• 131
1 vote
23 views

### Modeling hip fracture incidence (hospital-based cohort design)

Hoping someone can help me out with a question I have on an analysis looking at prosthetic hip fracture incidence following hip replacement surgery (exposure=type of implant, with reference being the ...
• 43
874 views

### Validity of non independent observations in Poisson regression when modelling incidence rates

I have a question regarding fitting a poisson model to non-independent observations when assessing the incidence of an outcome. I am interested in the incidence of some outcome, O, over time. I have ...
• 355
352 views

### Calculate probability of disease appearance

I am a doctor so please be kind with me and my basic understanding of statistics. I have a dataset consisting of patients and their visits and I have labelled the presence of a specific kind of mole ...
• 159
90 views

### Visualize the rate of reported cases of disease with respect to the population

I have to do some visualizations about vaccines. I downloaded data on reported cases of vaccine-preventable diseases (for example, measles, tetanus, etc.) here. These data are absolute values. I ...
• 213
511 views

### Interpreting Poisson regression model [duplicate]

I am having a mighty difficult time interpreting the following results given to me based on a generalized linear model with a Poisson distribution: Data: data represents the number of visitors to a ...
1 vote
57 views

### Standardized Infection Rate from predicted probabilities. Which method?

I need to calculate the Standardized Infection Rate (SIR), that is the ratio between actual cases of infection and predicted cases based on a predictive model. According to CDC https://www.cdc.gov/...
• 2,939
633 views

### Compare incidence rate

During the follow-up time, event A will happen multiple times, and there are 3 types of A, I call it A1, A2 and A3. I wonder if there is a statistical method that I can calculate the incidence rates ...
• 21