| Research content | Distribution and trend by year | Summation (%) | |||||
|---|---|---|---|---|---|---|---|
| 2000–2005 | 2006–2010 | 2011–2015 | 2016–2020 | 2021–2022 | |||
| Intervention session | Less than 12 sessions | 1 | 1 | 13 | 28 | 10 | 53 (78) |
| 13–20 sessions | 7 | 5 | 1 | 13 (19) | |||
| More than 21 sessions | 1 | 1 | 2 (3) | ||||
| Summation (%) | 1 (1.5) | 1 (1.5) | 20 (29) | 3 4(50) | 12 (18) | 68 (100) | |