Survey on clinical prediction models for diabetes prediction
© The Author(s) 2017
Received: 25 May 2017
Accepted: 22 June 2017
Published: 23 August 2017
Predictive analytics has gained a lot of reputation in the emerging technology Big data. Predictive analytics is an advanced form of analytics. Predictive analytics goes beyond data mining. A huge amount of medical data is available today regarding the disease, their symptoms, reasons for illness, and their effects on health. But this data is not analysed properly to predict or to study a disease. The aim of this paper is to give a detailed version of predictive models from base to state-of-art, describing various types of predictive models, steps to develop a predictive model, their applications in health care in a broader way and particularly in diabetes.
Predictive analytics use statistical or machine learning method to make a prediction about future or unknown outcomes . It uses text mining for unstructured data, answers the question “what is next step?” It uses historical and present data to predict future regarding activity, behaviour and trends. To do this it makes use of statistical analysis techniques, analytical queries and automated machine learning algorithms. Predictive analytics need experts to build predictive models. These models are used for prediction.
There are many applications of predictive analytics, out of which one is health care. A most common disease now a day’s is diabetes. People are suffering with it and the patient number increases day by day. The World Health Organization (WHO) predicts that by 2030 there will be approximately 350 million people worldwide affected by diabetes [2, 3]. Mostly whatever food we eat is converted into glucose or sugar. Now, this glucose or sugar is used for energy. Glucose is transported to body cells through insulin. If the body does not produce sufficient insulin or does not make proper use of insulin then it leads to diabetes.
There are four types of diabetes which are TYPE 1, TYPE 2, GESTATIONAL, PRE DIABETES. TYPE 1 diabetes is also known as insulin dependent diabetes  where the pancreas does not produce the hormone insulin. TYPE 2 diabetes is also known as non-insulin dependent diabetes  where adequate insulin is produced but the body cannot make use of insulin. Gestation diabetes is a type of diabetes which occurs during pregnancy . Pre diabetes refers to a situation where blood glucose levels are higher than normal but not so high to diagnosis as diabetes . Diabetes is a disease in which blindness, nerve damage, blood vessel damage, kidney disease and heart disease can be developed . By the use of predictive analytics in the field of diabetes, diabetes diagnosis, diabetes prediction, diabetes self-management and diabetes prevention can be achieved as per the literature survey.
Future the paper is organized into three sections. “Related work” gives the background of predictive analytics. “Clinical prediction model” describes different predictive models used in health care particularly for diabetes, followed by the summary of predictive models and ends with a conclusion and future work.
Taxonomy of predictive analytics
Difference between linear model and generalized model
Simple linear model
Generalized linear models
μ = E(Y) = β0 + β1 * X1 + β2 * X2+ ··· + βn*Xn
g(μ) = β0 + β1 * X1 + β2 * X2+ ··· + βn*Xn
Target variable Y does not depend on the value of Y for any other record, only the predictors
Target variable Y does not depend on the value of Y for any other record, only the predictors
Y is normally distributed
Distribution of Y is a member of the exponential family of distributions(normal, Poisson, gamma, binomial, negative binomial, inverse Gaussian)
Mean of Y depends on the predictors, but all records have the same variance
Variance of Y is a function of the mean of Y
Y is related to predictors through simple linear function
g(μ) is linearly related to the predictors. The function g is called the link function
Steps to develop predictive model
It was listed that there are six steps for developing predictive models. Which are listed as follows project definition, exploration, data preparation, model building, deployment, model management .
Percentage of usage of prediction model in organizations
Percent of model (%)
Use to guide decision and plans
To score records
Import models into BI tools or reports
Scores to create or augment rules
Embed rules or models in applications to automate or optimize processes
Selecting model according to situation
Depending on situation what model has to be selected is described as for segmentation use clustering algorithm, for developing recommender system use classification algorithm, Use decision tree when linear decision boundary is used, for predicting next outcome of time driven events use regression algorithms, to predict continuous values use regression, use naïve Bayes when features are conditionally independent, Machine learning is used for classifying text problems with ensemble model sometimes .
Deploying the predictive model
Deployment means using a model for the intended purpose. Most predictive models are built depending on the decisions made by the organization . Various ways for deploying the predictive model are sharing the model, score the model, incorporate the model in a BI report, embed the model in application .
Assessment of predictive model
Acceptance of predictive model based on c-statistics
Measures used model assessment when data is categorical
Project the efficiency of the model in terms of independent variables
To check whether results are reliable or not if F less than 0.5 model is OK else stop using those independent variables
Regression line Y = intercept + A * X1 + −B * X2
A and B are coefficients these are useful for forecasting
These are used to show how far the actual data points are from predicted data points
- 1.Uplift from model
Compare the performance of predictive model against random results with lift charts and decline tables.
Evaluate the validity of the discovery with target shuffling.
Test predictive model consistency using bootstrap sampling.
Use empirical measures of accuracy such as confidence levels or other statistical quantities if the aim of models is to provide highly accurate predictions or decisions.
Applications of predictive analytics
Predictive analytics have huge applications in various fields like Homeland security, Crime prevention, Infrastructure management, Cyber security, Intelligent Transportation, Health care and bioinformatics, Text mining, Fraud detection, Social media and decision support , Credit scores, Credit card, fraud detection, Mail Sorting, Weather prediction, Hot dogs and hamburgers , not only about resource allocation but also about where or how should to allocate resource, what to expect from outcomes of model, how to manage the key drivers of the economic model for better outcome? . There are four ways to monetize predictive models. The first way is for saving cost. The second way is using a predictive model for improving revenue. The third way is for returning investment and lastly is for risk management .
Predictive modeling tools
Predictive modeling tools
Predictive modeling tools
These tools are best used for
These tools require lots of historical data
Artificial intelligence models
These are new methods
Nearest neighbor pairing
Principal component analysis
Existing predictive models
Optum predictive model
This model is used to predict employees of the company, who are interested to join optum health management programs.
This algorithm determines which movies a customer is likely to enjoy.
This is a behaviour modeling algorithm as it learns from the behaviour of similar users and factors and recommends those sites to new users who for the same topic on the web.
Santa Cruz’s predictive policing program
This algorithm will analyse and detect patterns of past years crime data and predicts areas and windows of time that are high at risk.
It predicts the pattern of gambling players based on their level of dissatisfaction and intervene.
Fighting medicare fraud
Centers for Medicare and Medicaid Services (CMS) is poised to begin using predictive modeling technology to fight Medicare fraud. This algorithm automatic alerts and risk scores for claims.
This algorithm predicts people behaviour.
TCS diabetes Readmission predictive analytics model
This predictive model predicts patient readmission rates using a statistical model .
Clinical prediction model
Preparation for establishing clinical prediction models.
Model evaluation and validation.
Predictive analytics in health now a day
Inpatient data only
Data can not be accessed
Emr + claims + socioeconomic + care management
Inpatient + outpatient + ED
Unstructured data can be accessed
Different prediction models used for diabetes
A multi stage adjustment model with low misclassification rate which predicts which persons are most likely to develop diabetes is built by using KoGES dataset . A physiological model which can predict the blood glucose level 30 min in advance was developed using five patients data by training SVR with physiological features. This helped in producing best results than doctors . Another type of predictive model is sparse factor graph model. By using which diabetes complications are not the only forecast but also can discover the underlying associations between diabetes complications and lab test types. All algorithms were implemented in C++, and all experiments were performed on a Mac running Mac OS X with Intel Core i7 2.66 GHz and 4 GB of memory. The data set used for the experiment is collected from a geriatric hospital. The data set contain 1-year span data with 181,933 medical records, 35,525 patients data and 1945 types of lab tests. 60% of data was chosen for training the model and the rest for testing. The proposed model addresses two challenges feature sparseness and knowledge skewness .
In paper  the authors used two different types of neural networks to express which will output the accurate classifier in predicting diabetes. The two neural network models are multilayer neural network and probabilistic neural network. The dataset contains Pima Indian diabetes, having two classes and 768 samples. 576 samples were used for training and 192 were used for testing. The proposed methods were proved to better when compared with other previous methods.
In paper  the author developed a prediction model based on Hybrid-Twin Support Vector Machine (H-TSVM), which predicts whether a new patient is suffering from diabetes or not. They used Pima dataset for conducting an experiment. The factor that keeps this proposed method different from others is kernel function. The classifier produces an accuracy of 87.46%.
In paper  the author proposed a predicting model that classify type 2 diabetic treatment plans into three groups such as insulin, diet and medication. The dataset used for developing the model was JABER ABN ABU ALIZ clinic centre which contains 318 medical records. The model was developed using WEKA tool by applying J48 classifier and it has produced an accuracy of 70.8%.
In paper  the author developed a prediction model which predicts what are different types of disease a diabetic patient can develop. To develop the model a data set of 3 years span is collected from AR hospital with 739 patient details and 31 attributes. The pre processed data after deleting outliers by using distance based outlier detection (DBOD), is given as input to logistic regression model which was built by Bipolar Sigmoid Function that is calculated using Neuro based Weight Activation function. The model produced prediction accuracy of 90.4%.
In paper  author developed a hybrid model KSVM. The important criteria that make this model different from other methods are feature selection algorithm. PIMA data set was utilized to do experiments and results were produced. It was shown that diagnosis results using K-SVM are 99.74, 99.78, and 99.81 for learning experiments with amount 50, 60, and 70% data respectively, and 99.82, 99.85, and 99.90 for testing experiments with amount 50, 60, and 70% data respectively.
In paper  authors developed a prediction model that would predict whether a person would develop diabetes by considering daily lifestyle activities. To build prediction model PIMA diabetes data set was used and CART (Classification and Regression Trees) machine learning classifier was applied. The proposed model could provide an accuracy of 75%.
In paper  authors developed a decision tree model for the diagnosis of type 2 diabetes. They used Pima Indian diabetes dataset. Pre-processing techniques like attributes identification and selection, handling missing values, and numerical discretization was used to improve the quality of data. Weka tool was used, J48 decision tree classifier was applied to construct the decision tree model. The model produced an accuracy of 78.17%.
In paper  the authors have developed an expert healthcare predictive decision support system that predicts diabetes. This model is trained on Pima diabetes dataset. Decision tree and K-nearest neighbor algorithms are used to develop the model and found that C4.5 algorithm has achieved 90.43% accuracy.
In paper  the authors have developed a prediction model using Chi squared test to find not only dependencies between factors but also independences. Then CART is applied to build a prediction model which has 75% accuracy. Data was collected through questioners from 200 people and model was built using R tool.
In paper  authors developed an elastic net model which improves the accuracy for estimating glucose. The authors have collected 45 experimental sessions data set from diabetic patients. The data was collected from a noninvasive glucose device i.e., a blood sample is not taken. Three models were constructed using regularized methods LASSO, Ridged and Elastic net model. The elastic net model has compared with LASSO, ridged and partial least square regression and found Elastic net model is best.
From all of the techniques and prediction models discussed above, we want a prediction model that predicts diabetes of a diagnosed person. Since this output can be obtained depending on the time we would lie to use regression model. Of all regressions, Elastic Net is most useful as categorical, numerical and image or signal form data can be given as input to the model. The elastic net regression model is a combination of LASSO (Least Absolute Shrinkage And Selection Operator) and Ridged Regressions. Thus elastic net regression support shrinkage of coefficients as well as grouping effect. One more interesting point is numerical, categorical and image form data can be given as input to the model.
Summary of different prediction models used for diabetes
Multi stage adjustment model
Which person is most likely to develop diabetes
Five patients data
Predicts blood glucose level 30 min in advance
Sparse factor graph model
Forecast diabetes complications and uncover underlying relationship between diabetes and lab reports
Hybrid model to predict
Clustering + C4.5
Predict whether the diagnosed patient may develop diabetes within 5 years or not
Hybrid prediction model
Clustering + SVM
Optimal feature subset which helps in detecting diabetes with high accuracy
Multilayer neural network and probabilistic neural network
Output the accurate classifier in predicting diabetes
Hybrid-twin support vector machine
Predicts whether a new patient is suffering from diabetes or not
Jaber Abn Abu Aliz
Classify type 2 diabetic treatment plans
Logistic regression model
Bipolar sigmoid function that is calculated using neuro based weight activation function
Predicts what are different types of disease a diabetic patient can develop
Fuzzy logic, neural network, case based reasoning, rule based algorithm
Matlab and Mycbr plug-in
Used for diabetes diagnosing
Feature selection algorithm
Used for diabetes diagnosing
99.82–50, 99.85–60, and 99.90–70% of data
Used to predict whether a person would develop diabetes or not
Predicts whether patient develops diabetes or not
Predicts whether patient develops diabetes or not
Classify and diagnose onset and progression of diabetes
C4.5 and KNN
Predicts diabetes or not
Predicts whether a person fall into diabetic in future
LASSO, ridge and elastic net regressions
Predicts glucose level accurately
Elastic net regression
Predicts whether a person develops diabetes or not with in 6 months
To be worked out
In this paper a detail description of predictive modeling is presented, a combination of tradition and hybrid prediction models Modeling, This paper showed that hybrid models produce more accuracy than traditional models. A researcher who is willing to do research in developing clinical prediction model would be benefited by this paper. There is a wide range of scope for the development of clinical prediction models especially for diabetes as this is a modern disease in developing countries like India.
As per the survey of above papers we can find many gaps that are to be filled, which are usage of larger dataset [23, 34], outlier detection , improving prediction model , integration of optimization techniques to hybrid prediction model , implementation of prediction models for other diseases on android mobile , development of prediction model that include type 1 treatment plans with more attributes , usage of datasets of multiple classes .
The problems that are studies in the above papers for improving accuracy for prediction and, diagnosis of diabetes would be worked out further using elastic net regression. Elastic net regression is a combination of LASSO and Ridged Regression techniques to which categorical, numeric and image form data can be given to the regression.
NJ has contributed for acquisition of data, analysis and interpretation of data, Drafting of the manuscript. VB has served as scientific advisors in study conception, design and for critical revision. SR has critically reviewed the study proposal. All authors read and approved the final manuscript.
I would like to show our gratitude to Dr. Vasantha Vedachalam for sharing her pearls of wisdom with me during the course of this research. Dr. Subba Laxmi for providing necessary information. Dr. P.V. Rao for his comments that greatly improved the manuscript. I thank Dr. Madhu Bala for her insight and expertise that greatly assisted the research. I am also immensely grateful to Ms. B. Padmaja for her comments and interpretations on an earlier version of the manuscript, which was helpful for improvement of the manuscript.
The authors declare that they have no competing interests.
Availability of data and materials
PIMA Indian data set—UCI Repository.
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