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Survey paper | Open | Published:

Survey on clinical prediction models for diabetes prediction

Abstract

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.

Introduction

Predictive analytics use statistical or machine learning method to make a prediction about future or unknown outcomes [1]. 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 [4] where the pancreas does not produce the hormone insulin. TYPE 2 diabetes is also known as non-insulin dependent diabetes [4] where adequate insulin is produced but the body cannot make use of insulin. Gestation diabetes is a type of diabetes which occurs during pregnancy [5]. Pre diabetes refers to a situation where blood glucose levels are higher than normal but not so high to diagnosis as diabetes [6]. Diabetes is a disease in which blindness, nerve damage, blood vessel damage, kidney disease and heart disease can be developed [7]. 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.

Related work

Predictive analytics

As per literature, there are many forms of describing predictive analytics. It is inductive [8]. It doesn’t expect anything about data but it allows the data lead the way. It uses statics, machine learning, neural computing, robotics, computational mathematics and artificial intelligence to explore all data and find meaningful relationships and patterns. Predictive analytics is a set of business intelligence (BI) technologies that uncover relationships and patterns within large volumes of data that can be used to predict behaviour and events. To be more clear see the Fig. 1. Machine learning used by predictive analytics is a technique to train algorithm which can predict an output based on some input value. This leads to correlations and not to conclusions [9].

Fig. 1
figure1

Taxonomy of business intelligent technologies

Taxonomy of predictive analytics

From previous work, there are two major types of predictive analytics such as supervised learning and unsupervised learning [8, 10]. Supervised learning is a process of creating predictive models using a set of historical data and produce predictive results. Examples are classification, regression and time-series analysis where as in Unsupervised learning does not use the previously known result to train its models. It uses descriptive statics. It identifies clusters or groups [8]. Further classification of predictive models are of nine types business rules, classification and decision trees [11,12,13] naive Bayes, linear regression [10,11,12], logistic regression [11, 12, 14], neural networks (NNs) [11,12,13], machine learning, support vector machines (SVMs), natural language processing (NLP) [11]. In paper [13] the author has described seven types of regression models, each holding importance of its own. He listed seven types of regression models as linear regression, logistic regression, polynomial regression, stepwise regression, ridge regression, Lasso regression, elastic net regression. More versions of predictive models are described in two ways Smooth Forecast Model which describe smooth variable outcome for example profit and Scoring Model which describe binary outcome for example whether the blood report indicates disease or normal condition [9]. Another list of predictive models is linear models, decision trees, neural networks, clusters models, support vector machines, expert systems. The difference between simple linear model and generalized linear model is presented in Table 1 [10]. Furthermore, a list of models are Time-series analysis, Monte Carlo simulations, Statistics for spatial data [15].

Table 1 Difference between linear model and generalized model

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 [9].

Usage of predictive model by Organizations is summarized in paper [16] which is listed in Table 2.

Table 2 Percentage of usage of prediction model in organizations

A basic architecture about building predictive model consisting of three layers is presented in Fig. 2. What is important is how to implement model inputs and outputs, how model show growth when it is turned on or off, when to upgrade or replace according to ongoing time [11].

Fig. 2
figure2

High-level data architecture to build predictive model for business

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 [11].

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 [17]. 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 [8].

Assessment of predictive model

Predictive models are commonly assessed using c-statistics. This measure indicates whether the predictive model predicts positive or negative outcomes. If model c-statistics exceeds 0.7 it is considered as an acceptable prediction, if c-statistics is 0.5 then model prediction is not good [18]. c-statistics is equal to the area under ROC curve. Grading based on c-statistics is shown as in Table 3. Another way to assess the prediction model is Analysis of variance (ANOVA) when data is categorical [11]. The measures are listed in Table 4.

Table 3 Acceptance of predictive model based on c-statistics
Table 4 Measures used model assessment when data is categorical

Some metrics that are considered for successful model are

  1. 1.

    Uplift from model

    1. a.

      Compare the performance of predictive model against random results with lift charts and decline tables.

    2. b.

      Evaluate the validity of the discovery with target shuffling.

    3. c.

      Test predictive model consistency using bootstrap sampling.

  2. 2.

    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 [1], Credit scores, Credit card, fraud detection, Mail Sorting, Weather prediction, Hot dogs and hamburgers [16], 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? [19]. 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 [20].

Predictive modeling tools

Predictive modeling tools [19] are summarized in Table 5.

Table 5 Predictive modeling tools

Existing predictive models

From paper [16] author have listed existing predictive models and their usage

  1. 1.

    Optum predictive model

    This model is used to predict employees of the company, who are interested to join optum health management programs.

  2. 2.

    Netflix

    This algorithm determines which movies a customer is likely to enjoy.

  3. 3.

    Match.com

    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.

  4. 4.

    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.

  5. 5.

    Harrahs casino

    It predicts the pattern of gambling players based on their level of dissatisfaction and intervene.

  6. 6.

    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.

  7. 7.

    VISA

    This algorithm predicts people behaviour.

  8. 8.

    TCS diabetes Readmission predictive analytics model

    This predictive model predicts patient readmission rates using a statistical model [21].

Clinical prediction model

Clinical model

The clinical prediction model is very valuable as it can be applied to a various scenario like screening, prediction, medical decision making and education in health. In the medical field, the prognosis is considered as a fundamental component. In paper [22] a process of developing clinical prediction model is explained with five steps:

  1. i.

    Preparation for establishing clinical prediction models.

  2. ii.

    Dataset selection.

  3. iii.

    Handling variables.

  4. iv.

    Model generation.

  5. v.

    Model evaluation and validation.

Predictive analytics uses regression models on available data for predicting outcomes mostly in the medical field. In past medical data was collected manually by handwritten, dictated or incomplete, this data was small for predictive modeling. But now a day because of EMRs, diverse and large digital data of health care is available as listed in Table 6. Natural processing languages are used to access unstructured data. This increases the quality of data and also quality prediction. The relative predictive power of a statistical model increases exponentially when using millions of patients instead of hundreds of patients. To discover relevant predictive variables clinical, claims, socioeconomic and care management data should be integrated to form one dataset [18].

Table 6 Predictive analytics in health now a day

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 [23]. 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 [24]. 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 [25].

A hybrid model has been developed to predict whether the diagnosed patient may develop diabetes within 5 years or not. A tool used for this purpose is WEKA and the data set was PIMA Indian diabetes data set. This hybrid model has achieved 92.38% accuracy [26]. The details of the hybrid model are shown in Fig. 3.

Fig. 3
figure3

Hybrid model for predicting type 2 diabetes

Another hybrid prediction model helps in producing optimal feature subset. This helps in detecting diabetes with high accuracy. To implement the model WEKA tool is used on PIMA Indian diabetic dataset. The proposed models have given an accuracy of 98.9247%. The procedure adopted by authors in developing predictive model is first preprocessed the dataset, then compute F-score values of features, select features with high F-score as discriminative features, then k-means algorithm is used to select feature subset that gives minimum clustering error and finally SVM is used to classification [27] as shown in Fig. 4.

Fig. 4
figure4

Hybrid model for predicting type 2 diabetes

In paper [28] 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 [29] 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 [30] 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 [31] 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 [32] a tool FNC was developed that can be used for diagnosing diabetes as shown in Fig. 5. The proposed model is developed by incorporating three techniques fuzzy logic, neural network and Case based reasoning with 200 patient details having 16 input attributes. Fuzzy logic and neural networks are implemented by using Matlab, Case based Reasoning is implemented by using MyCBR plug-in. After obtaining the result from three approaches rule based algorithm was applied to all three techniques to improve the accuracy. Finally, the best accuracy was obtained for case based reasoning.

Fig. 5
figure5

FNC model for diagnosis of diabetes

In paper [33] 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 [34] 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 [35] authors developed a prediction model that would predict whether a person develops diabetes or not. To achieve this PIMA diabetes dataset was used. In the proposed method first controlled binning technique is applied then multiple regression was used to improve the accuracy of the model. After incorporating all techniques an accuracy of 77.85% was achieved. The controlled binning technique which is innovative thought in this paper is calculated by using the Eqs. (1) and (2)

$$ {\text{Bin size }} = \, \left( {\text{Loss percentage}} \right)\;*{\text{ total number of transactions}} $$
(1)
$$ {\text{Loss on each data element }} = \, \left( {{\text{loss}}\% \, *{\text{ value of data element}}} \right) $$
(2)

In paper [36] 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 [37] the authors developed a prediction model by using neural networks to classify and to diagnose onset and progression of diabetes. They have used 545 patients’ data from a diabetes clinic. First, they trained and tested neural networks with a different number of neurons and found a neural network with seven neurons has produced highest accuracy. The memetic algorithm is used to update weights which improved the accuracy of the model from 88.0 to 93.2%. this model was compared with other models too. But a neural network with seven neurons and application of memetic algorithm is observed as the best model (Figs. 6, 7).

Fig. 6
figure6

Prediction model developed by using neural networks, implementing memetic algorithm to this model, to improve the accuracy of the model

Fig. 7
figure7

Proposed prediction model using elastic net regression to predict the development of diabetes

In paper [38] 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 [39] 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 [40] 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

The survey below summarizes the previously developed systems. Different datasets, tools, techniques used previously are listed in Table 7.

Table 7 Summary of different prediction models used for diabetes

Conclusions

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 [35], improving prediction model [34], integration of optimization techniques to hybrid prediction model [33], implementation of prediction models for other diseases on android mobile [31], development of prediction model that include type 1 treatment plans with more attributes [30], usage of datasets of multiple classes [4].

Future work

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.

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Authors’ contributions

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.

Acknowledgements

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.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

PIMA Indian data set—UCI Repository.

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Correspondence to N. Jayanthi.

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Keywords

  • Predictive analytics
  • Diabetes
  • Clinical prediction models
  • Traditional model
  • Hybrid model
  • Machine learning