Table 3.
Mediation effect of perceived stress measured at 6 weeks
| Estimate | SE | p value | 95% bootstrap CI | |
|---|---|---|---|---|
| SDQ Total Difficulties score | ||||
| Total effect: intervention effect on SDQ Total Difficulties score (12 weeks) | −1·24 | 0·73 | 0·088 | −2·66 to 0·18 |
| (a) Intervention effect on PSS-4 score (6 weeks) | −0·72 | 0·32 | 0·023 | −1·34 to −0·10 |
| (b) PSS-4 score (6 weeks) effect on SDQ Total Difficulties score (12 weeks) | 0·38 | 0·16 | 0·016 | 0·07 to 0·70 |
| Indirect effect: a × b* | −0·28 | 0·17 | 0·11 | −0·62 to 0·06 |
| YTP score | ||||
| Intervention effect on YTP score (12 weeks) | −1·00 | 0·32 | 0·0020 | −1·64 to −0·37 |
| (a) Intervention effect on PSS-4 score (6 weeks) | −0·72 | 0·32 | 0·023 | −1·34 to −0·10 |
| (b) PSS-4 score (6 weeks) effect on YTP score (12 weeks) | 0·21 | 0·07 | 0·0020 | 0·08 to 0·34 |
| Indirect effect: a × b* | −0·15 | 0·09 | 0·088 | −0·32 to 0·02 |
SDQ=Strengths and Difficulties Questionnaire. PSS-4=Perceived Stress Scale 4-item version. YTP=Youth Top Problems measure.
*
The proportion of the overall effect that is mediated by PSS-4 is 23% (−0·28/–1·24) for mean SDQ Total Difficulties score and 15% (−0·15/–1·00) for mean YTP score.