A Systematic Review of Healthcare Big Data

Table 4

Important sources of healthcare data.

Healthcare data	Features	Sources
Clinical data	Data within electronic health records (EHRs) can be either structured (e.g., EMRs and clinical data), unstructured (e.g., clinical trials data), or semistructured (e.g., claims data) forms	[26]
Patient-generated data	Biometric data, social media data, online data (e.g., blogs, Facebook posts, and Twitter)	[27]
Sensor data	Data produced by sensor-based devices (e.g., vital signs, ECG, and handheld devices)	[28–30]
Genomic data	Gene typing (e.g., gene expression and DNA sequence)	[11, 31, 32]
Clinical research data	Health product data (e.g., drug information)	[33]
External data	Insurance data (e.g., financial data); Biometric data (e.g., fingerprints)	[34]