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Table 3 Results on primary and secondary outcomes

From: StudiCare procrastination - Randomized controlled non-inferiority trial of a persuasive design-optimized internet- and mobile-based intervention with digital coach targeting procrastination in college students

 

Time effects across both groups

Time x group interaction effects

Time x predictor effects

Outcome

γ

p

Cohen’s d

[95%-CI]

γ

p

Cohen’s d [95%-CI]

γ

p

IPS

-0.79

< 0.001

t1: − 0.43

[-0.61; -0.25]

t2: − 0.72

[-0.91; -0.53]

t3: − 0.89

[-1.08; -0.70]

-0.03

0.84

t1: 0.04

[-0.22; 0.30]

t2: -0.03

[-0.29; 0.23]

t3: 0.08

[-0.18; 0.34]

Gender: − 0.14

Modules: − 0.2

Study semester: 0.11

0.43

0.25

0.40

STS

-0.62

< 0.001

t1: − 0.41

[-0.59; -0.23]

t2: − 0.51

[-0.7; -0.34]

t3: − 0.85

[-1.04; -0.66]

-0.04

0.75

t1: -0.26

[-0.52; -0.00]

t2: -0.11

[-0.37; 0.15]

t3: -0.23

[-0.49; 0.03]

Gender: -0.02

Modules: − 0.06

Study semester: 0.13

0.9

0.75

0.39

PHQ

-0.15

< 0.001

t1: − 0.30

[-0.48; -0.12]

t2: − 0.41

[-0.59; -0.23]

t3: − 0.50

[-0.68; -0.32]

0.26

0.09

t1: -0.15

[-0.41; 0.11]

t2: 0.21

[-0.05; 0.47]

t3: -0.09

[-0.35; 0.17]

Gender: − 0.13

Modules: 0.16

Study semester: 0.10

0.6

0.45

0.64

GAD

-0.25

0.01

t1: − 0.23

[-0.41; -0.05]

t2: − 0.37

[-0.55; -0.19]

t3: − 0.38

[-0.56; -0.20]

0.25

0.09

t1: -0.29

[-0.55; -0.03]

t2: 0.51

[0.25; 0.77]

t3: 0.37

[0.11; 0.63]

Gender: 0.07

Modules: 0.1

Study semester: 0.17

0.58

0.5

0.15

PSS

-0.36

< 0.001

t1: − 0.44

[-0.62; -0.26]

t2: − 0.60

[-0.79; -0.41]

t3: − 0.73

[-0.92; -0.54]

0.26

0.04

t1: -0.12

[-0.38; 0.14]

t2: 0.26

[0.00; 0.52]

t3: -0.04

[-0.30; 0.22]

Gender: − 0.06

Modules: 0.02

Study semester: 0.15

0.62

0.88

0.12

WIRKSTUD*

0.38

< 0.001

t1: 0.40

[0.21; 0.58]

t2: 0.60

[0.41; 0.79]

t3: 0.79

[0.6; 0.98]

-0.20

0.10

t1: 0.18

[-0.08; 0.44]

t2: -0.02

[-0.28; 0.24]

t3: -0.52

[-0.78; -0.26]

Gender: − 0.13

Modules: 0.08

Study semester: − 0.07

0.37

0.56

0.48

BSSS perceived, emotional support*

-0.49

< 0.001

t1: 0.03

[-0.15; 0.21]

t2: 0.18

[-0.00; 0.36]

t3: − 0.11

[-0.29; 0.07]

-0.19

0.22

t1: 0.28

[0.02; 0.54]

t2: 0.17

[-0.08; 0.43]

t3: -0.05

[-0.31; 0.21]

Gender: − 0.17

Modules: − 0.02

Study semester: − 0.33

0.75

0.89

0.02

BSSS perceived, instrumental support*

-0.48

< 0.001

t1: 0.12

[-0.06; 0.3]

t2: 0.28

[0.10; 0.46]

t3: 0.05

[-0.13; 0.23]

-0.16

0.46

t1: 0.60

[0.34; 0.86]

t2: 0.22

[-0.04; 0.48]

t3: -0.03

[-0.29; 0.23]

Gender: 0.26

Modules: − 0.06

Study semester: − 0.29

0.23

0.77

0.08

BSSS Need for support*

-0.43

< 0.001

t1: − 0.12

[-0.3; 0.06]

t2: − 0.14

[-0.32; 0.04]

t3: − 0.48

[-0.66; -0.3]

-0.08

0.58

t1: 0.11

[-0.15; 0.37]

t2: -0.09

[-0.35; 0.17]

t3: -0.08

[-0.34; 0.18]

Gender: − 0.03

Modules: 0.29

Study semester: 0.07

0.85

0.07

0.71

BSSS Support Seeking*

-0.40

< 0.001

t1: − 0.12

[-0.3; 0.06]

t2: 0.13

[-0.05; 0.31]

t3: 0.0

[-0.18; 0.18]

-0.47

0.01

t1: 0.04

[-0.22; 0.30]

t2: -0.02

[-0.28; 0.24]

t3: -0.18

[-0.44; 0.08]

Gender: 0.23

Modules: − 0.18

Study semester: − 0.36

0.29

0.39

0.04

  1. Note. *higher scores indicate better outcome; CI = Confidence Interval;
  2. IPS = Irrational Procrastination Scale, STS = Susceptibility to Temptation Scale, WIRKSTUD = Study-related self-efficacy, PHQ-8 = 8 item version of the Patient Health Questionnaire, GAD-7 = 7 item version of the General Anxiety Disorder questionnaire,
  3. PSS = Perceived Stress Scale, BSSS = Berliner Social Support Scale