Table 1 Raw means (SDs) for all outcomes on each time point by condition and between-group Cohen’s d effect sizes (Study 1)

Mental Wellbeing^a

 Pretest

54

3.26 (0.78)

52

3.26 (0.67)

 1-week FU

51

3.29 (0.89)

49

3.18 (0.59)

0.16 [-0.24–0.55]

 4-week FU

48

3.29 (0.81)

42

3.17 (0.68)

0.18 [-0.24–0.59]

Stress Mindset

 Pretest

54

1.73 (0.79)

52

1.95 (0.59)

 Posttest

54

2.52 (0.74)

52

2.09 (0.64)

0.64 [0.25–1.03]

 1-week FU

51

2.20 (0.79)

49

2.10 (0.60)

0.15 [-0.24–0.54]

 4-week FU

48

2.12 (0.71)

42

2.07 (0.65)

0.07 [-0.34–0.49]

Positive Affect

 Pretest

54

34.54 (6.75)

52

33.37 (6.41)

 Posttest

54

34.50 (6.69)

52

32.12 (5.93)

0.37 [-0.02–0.75]

 1-week FU

51

35.04 (7.74)

49

33.06 (5.49)

0.30 [-0.09–0.70]

 4-week FU

48

34.65 (7.25)

42

33.17 (6.71)

0.23 [-0.19–0.64]

Negative Affect

 Pretest

54

16.59 (4.79)

52

16.25 (4.50)

 Posttest

54

15.48 (5.72)

52

15.17 (4.73)

0.06 [-0.32–0.44]

 1-week FU

51

17.16 (6.23)

49

16.39 (4.86)

0.15 [-0.24–0.54]

 4-week FU

48

17.06 (6.12)

42

16.07 (4.87)

0.19 [-0.22–0.61]

Locus of Control

 Pretest

54

38.15 (7.48)

52

40.37 (5.89)

 Posttest

54

38.65 (8.51)

52

40.15 (5.53)

-0.21 [-0.59–0.17]

 1-week FU

51

38.76 (8.74)

49

38.04 (7.12)

0.10 [-0.29–0.49]

 4-week FU

48

39.27 (7.74)

42

39.76 (6.06)

-0.07 [-0.48–0.35]

Perceived Stress

 Pretest

54

13.31 (6.35)

52

11.08 (4.74)

 Posttest

54

10.91 (7.15)

51

11.04 (5.98)

-0.02 [-0.40–0.36]

 1-week FU

51

12.69 (7.13)

49

12.65 (5.64)

0.01 [-0.39–0.40]

 4-week FU

48

13.90 (7.03)

40

13.05 (4.83)

0.14 [-0.28–0.55]