Table 5.

Measuring the quality of the primary studies

PS	Captures	Citations	Usage	Relevance
17	1203	50	6107	0.529
11	208	16	89	0.110
01	66	20	0	0.109
06	98	17	0	0.099
15	261	11	398	0.098
04	302	8	745	0.095
08	117	10	984	0.084
10	111	12	0	0.075
18	132	10	264	0.073
05	54	7	355	0.049
09	49	8	0	0.047
12	88	6	107	0.044
07	85	2	575	0.032
13	26	4	0	0.024
02	64	2	121	0.021
16	22	2	0	0.013
03	55	0	111	0.010
14	52	0	61	0.008