Table 1.
Quality assessment standard for a cross-over study.
Fig 1.
Flow chart for selection of studies.
Fig 2.
Summary of the quality assessment of the 139 cross-over trials
1. Appropriate cross-over design; 2. Randomized order of receiving treatment; 3. Carry-over effects; 4. Unbiased data; 5. Allocation concealment; 6. Blinding; 7. Incomplete outcome data; 8. Selective outcome reporting; 9. Other bias
Table 2.
The results of quality reassessment of different items.