QAnalysis: a question-answer driven analytic tool on knowledge graphs for leveraging electronic medical records for clinical research

Table 4 The result of coverage and precision

Number of Nodes	Number of Question	Coverage (%)	Precision (%)
1	20	95.00	100.00
2	112	75.00	98.81
3	62	74.19	95.65
> 3	17	94.11	81.25
total	211	78.20	96.36