Table 2.
Direction of relationship | Number of findings | |||
---|---|---|---|---|
Availability | Price | Variety | Quality | |
Inverse (unexpected) | 2 | 11 | 0 | 0 |
None | 27 | 12 | 3 | 4 |
Positive | 9 | 5 | 1 | 1 |
Number of exposure measures | 20 | 13 | 3 | 4 |
Number of papers | 11 | 10 | 3 | 4 |
Number of studies | 11 | 10 | 3 | 4 |