Table 2.

Descriptive table showing the biases of the included randomized clinical trials.

Study	Question Focus	Appropriate Randomization	Allocation Blinding	Double-Blind	Losses (<20%)	Prognostics or Demographic Characteristics	Outcomes	Intention to Treat Analysis	Sample Calculation	Adequate Follow-Up
[19]	Yes	Yes	Yes	Yes	Yes	No	Yes	NR	Yes	Yes
[20]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
[21]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
[22]	Yes	NR	Yes	Yes	Yes	Yes	Yes	No	NR	Yes
[23]	Yes	NR	NR	No	NR	No	Yes	No	NR	Yes
[24]	Yes	NR	No	No	No	Yes	Yes	No	Yes	Yes
[25]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
[26]	Yes	NR	NR	No	NR	No	Yes	No	NR	Yes
[27]	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No	Yes
[28]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes

NR—not reported.