| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be a significant difference | 30 |
|
| 2 | [is] a significant difference | 15 |
|
| 3 | is a significant difference | 14 |
|
| 4 | [was/were] a significant difference | 13 |
|
| 5 | was a significant difference | 13 |
|
