How to establish and evaluate clinical prediction models – Statswork

How To Establish And Evaluate Clinical Prediction Models

Dr. Nancy Agnes, Head, Technical Operations, Tutorsindia info@ tutorsindia.com

models are all widely used approaches.

Keywords: Statistical analysis help, clinical research analysis, data collection services, clinical prediction

models,

multiple

linear

regression analysis, logistic regression analysis, Clinical Research & Analytics,

The secret to statistical analysis, data modelling, and project design is assessing and verifying prediction models' efficacy.

It is also the most difficult aspect of data analysis technology.

statistics services, clinical trial data analysis, External Validation Of Clinical

II. CLINICAL PREDICTION MODEL

Prediction Models A clinical prediction model is a tool used I. INTRODUCTION The

use

of

a

in healthcare to measure estimates of the

parametric/semi-

parametric/non-parametric

mathematical

likelihood of the future course of a specific patient outcome using multiple clinical or

model to estimate the probability that a

non-clinical

subject currently has a certain condition or

checklist for developing a valid prediction

the possibility of a certain outcome in the

model is presented in a clinical prediction

future is referred to as a clinical predictive

model. A clinical prediction model can be

model.

used in various clinical contexts, including

Various

regression

analysis

predictors.

A

realistic

approaches are used to model clinical

screening

prediction models, and the statistical

forecasting future events such as disease,

nature of regression analysis is to find

and assisting doctors in their decision-

"quantitative causality." To put it another

making and health education. Despite the

way, regression analysis is a quantitative

positive effects of clinical prediction

assessment of how much X impacts Y.

models on practice, prediction modelling

Multiple linear regression models, logistic

is a difficult process that necessitates

for

asymptomatic

illness,

regression models, and Cox regression

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meticulous statistical analysis and sound clinical judgments.

III. STEPS TO ESTABLISHING A CLINICAL PREDICTION MODEL There exist several types of research

S.NO

DISEASE

SYMPTOMS

1

CANCER

Unusual lump, changes in the

detailing the methods to construct clinical

mole,

prediction models. However, there is no

cough

and

proper method to construct the prediction

hoarseness,

model in medicine. The construction and

unusual

evaluation

diarrhoea

of

prediction

models

are

constipation

classified into five steps.

Step

1:Gathering

the

and

ideations

and

2

questions for enhancing the model.

CARDIOVASCULAR

Chest

pain,

DISEASE

chest tightness, shortness

of

It incorporates structuring the research

breath,

questions, such as finding the target

numbness and

variable for predicting which age group of

weakness.

the targeted people you want to predict.

3

ARTHRITIS

Pain in hip or

For instance, gathering one patient details

joint, swelling,

and use it as a trained data set to test the

colour changes in

other data set of another patient's details.

the

skin,

loss

[1].

of

appetite.

Step 2: Selection of data 4

DIABETES

Darkened area

Data collection is a vital part of statistical

of skin, High

or clinical research. Nevertheless, the

blood pressure

perfect data and a perfect model can't

and cholesterol levels

exist. It would be nice to look for the most appropriate.

The primary dataset with the endpoint of the study and all key predictors may not be

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available at all the time. Secondary or

The Bayesian network was implemented to

administrative data sources are mandatory.

manipulate the independent variables of

Based on the various data types of

some diseases in the crucial stage of

datasets, prediction models can be utilized.

treatment. This model predicts and offers a

[2] For instance, the epidemiology study is based on the Data Mining systematic

way to handle the disease along with preventive measures [3].

approach.

Step 4: Generating model

Step 3: Ways to handle variables

There are no proper rules to select a

Most of the time, researchers may face challenging situations where the variables are highly correlated to each other, excluded in the study. Variables don't show statistical significance or the petite effect size. But it will contribute to the predictive model. Researchers will handle the missing data problems, categorical data, etc., before getting the interference.

particular model for the statistical analysis.

There are some standard methods to build a model using Linear regression analysis, logistic regression analysis, and Cox models. Sometimes the clinical data encounters over-fitting of the model and its results in as estimates. This over-fitting issue can be detected using Akaike Information

Criteria

or

Bayesian

Information Criteria. The smaller AIC and BIC values result in a good fit for the IV. CLINICAL PREDICTION MODELS CODE:

model. [4] Using Multivariate prediction models

for

analyzing

the

different

characteristics of various patients.

Code number

Disease/ Deficiency

Step 5: Evaluation and validation of the model After building the model, it is

ICD-10-R50

fever

ICD-R05

cough

necessary to evaluate and validate the predictive power of the model. The key components that evaluate the model are

ICD-10-CM-

pain

R52

ICD-9-CM-

calibration which plots the proportion, and discrimination classifies the events like

headache

784.0

success or failure. There are two types of data validation, namely internal and external validation of the model. Internal

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validation evaluates the model within the

the scrutiny of around 33 research articles

data, whereas external validation can be

and found that most of the validation is

done using the re-sampling technique,

external validation and identified the

usually through bootstrapping. It means

validity using the calibration slope.

you are creating or generating new data sets with similar characteristics to the original data and validating the study's method through the newly created or bootstrapped data. Further, there are several statistical measures to evaluate the model. Some of them are ROC curve, AUC curve, sensitivity and specificity,

Figure 2: This flow diagram illustrates the

likelihood

ratio,

value,

progress through the various phases of the

calibration

plot,

Hosmer-

CARDAMON phase II clinical trial,

R

square

c-index,

Lemeshow test, AIC, BIC, etc.

including the impact of COVID‐19 on the 70 patients on maintenance K across the two treatment arms at the start of the lockdown period. The 15 patients who stopped K maintenance joined the 170 patients who were already on long‐term follow‐up on 24 March 2020, bringing the number up to a total of 185. SCT, stem cell transplantation;

K,

carfilzomib;

C,

cyclophosphamide; d, dexamethasone [6].

Figure 1: Slope of Calibration plot –

V. FUTURE SCOPE:

Source:

Stevens

and

Poppe

(2020)

Besides,

Stevens

and

Poppe

(2020)

Based on the patient details, we can

suggested the Cox- calibration slope using

predict the further severe causation of

a logistic regression model instead of

disease in the future. By gathering the data

using the predictive model's calibration

from a single patient may help to predict

slope. This suggestion has been made after

other similar patients for better treatment.

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prediction models: feature selection methods in

Big data support for manipulating vast amounts

of

clinical

trials,

complexitsimultaneously

data mining could improve the results."

without

with

Journal of clinical epidemiology 71 (2016): 76-

high

85.

accuracy.

3.

Chowdhury, Mohammad Ziaul Islam, and Tanvir C. Turin. "Variable selection strategies and their importance in clinical prediction modeling." Family medicine and community

TABLE 1 Concepts and Techniques of

health 8.1 (2020).

Clinical prediction models: 4.

S.NO

METHODS

1

Data

comparative effectiveness of bootstrap-based

PURPOSES

REFERENCES

optimism

correction

development

of

Collection To train and test the [1]

methods

multivariable

in

the

clinical

prediction models." BMC Medical Research

using Surveys

data

between two 21.1 (2021): 1-14.

Methodology

patients

5.

2

Iba, Katsuhiro, et al. "Re-evaluation of the

Epidemiology study

Stevens, R. J. and Poppe, K. K. (2020).

Validation of Clinical Prediction Models: What

Data mining of data [2] does the "Calibration Slope" Really Measure?. sets

Journal of clinical epidemiology, 118, pp. 93– 99.

3

Bayesian Network

To

predict 6.

the [3]

Camilleri, Marquita, et al. "COVID‐19 and

characteristics based myeloma clinical research–experience from the CARDAMON clinical trial." British Journal of on the independent

variable 4

Haematology 192.1 (2021): e14.

Multivariate analysis To manipulate the [4] independent variables

REFERENCES: 1.

Schmidt, André, et al. "Improving prognostic accuracy in subjects at clinical high risk for psychosis: systematic review of predictive models and meta-analytical sequential testing simulation."

Schizophrenia

Bulletin

43.2

(2017): 375-388.

2.

Bagherzadeh-Khiabani, Farideh, et al. "A tutorial on variable selection for clinical

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