| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adv] [num] months | 217 |
|
| 2 | at least [adj] months | 193 |
|
| 3 | at [adv] six months | 73 |
|
| 4 | at [adv] six months | 73 |
|
| 5 | at [adv] three months | 40 |
|
| 6 | at [adv] three months | 40 |
|
| 7 | at [adv] two months | 25 |
|
| 8 | at [adv] two months | 25 |
|
| 9 | at [adv] 18 months | 14 |
|
| 10 | at [adv] 18 months | 14 |
|
| 11 | at about [adj] months | 10 |
|
| 12 | at [adv] 12 months | 9 |
|
| 13 | at [adv] nine months | 9 |
|
| 14 | at [adv] 12 months | 9 |
|
| 15 | at [adv] nine months | 9 |
|
| 16 | at [adv] twelve months | 8 |
|
| 17 | at [adv] twelve months | 8 |
|
| 18 | at around [adj] months | 6 |
|
| 19 | at [adv] four months | 6 |
|
| 20 | at [adv] four months | 6 |
|
| 21 | at [adv] five months | 5 |
|
| 22 | at [adv] five months | 5 |
|
| 23 | at [adv] eighteen months | 5 |
|
| 24 | at [adv] eighteen months | 5 |
|
