Table 2.
Differences in baseline variables between participants who were lost to follow-up (both assessment) and those who completed at least one assessment (N=1169).
| Characteristics | Therapist-guided ICBTa (n=386), mean (SD) | Self-help ICBT (n=391), mean (SD) | Control (n=392), mean (SD) | Comparison | |||||||||
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Retained (n=226) | Lost (n=160) | Retained (n=220) | Lost (n=171) | Retained (n=246) | Lost (n=146) | Lost vs retained | Group×lost | |||||
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F test (df) | P value | F test (df) | P value | |||
| Weekly drinks | 23.7 (16.7) | 25.9 (16.1) | 24.4 (17.5) | 28.3 (17.4) | 24.4 (17.5) | 28.3 (17.4) | 11.99 (1) | <.001 | 0.43 (2) | .65 | |||
| AUDITb | 21.6 (5.4) | 22.9 (5.9) | 21.9 (5.6) | 22.6 (5.5) | 21.9 (5.6) | 22.6 (5.5) | 6.89 (1) | .009 | 0.42 (2) | .66 | |||
| AUDIT-Cc | 8.1 (1.8) | 8.6 (1.5) | 8.1 (1.8) | 8.5 (1.7) | 8.1 (1.8) | 8.5 (1.7) | 15.07 (1) | <.001 | 0.04 (2) | .96 | |||
| ICD-10 d | 4.2 (1.4) | 4.3 (1.3) | 4.15 (1.4) | 4.5 (1.3) | 4.2 (1.4) | 4.5 (1.3) | 4.39 (1) | .04 | 1.36 (2) | .26 | |||
| DSM-5 e | 7.0 (2.4) | 7.3 (2.3) | 7.07 (2.3) | 7.5 (2.1) | 7.1 (2.3) | 7.5 (2.1) | 5.48 (1) | .02 | 0.14 (2) | .87 | |||
| MADRS-Sf | 18.9 (8.7) | 19.1 (10.0) | 17.3 (8.9) | 18.8 (8.8) | 17.3 (8.9) | 18.8 (8.8) | 3.87 (1) | .049 | 0.62 (2) | .54 | |||
| GAD-7g | 8.3 (5.3) | 9.4 (5.7) | 7.7 (5.4) | 8.8 (5.2) | 7.7 (5.4) | 8.8 (5.2) | 12.82 (1) | <.001 | 0.01 (2) | .99 | |||
| EQ-5Dh | 0.72 (0.19) | 0.69 (0.24) | 0.73 (0.19) | 0.72 (0.18) | 0.73 (0.19) | 0.72 (0.18) | 7.37 (1) | .007 | 1.05 (2) | .35 | |||
| Nondrinking days | 2.9 (1.97) | 2.7 (2.08) | 2.85 (2.16) | 2.6 (2.08) | 2.85 (2.16) | 2.6 (2.08) | 3.61 (1) | .06 | 0.01 (2) | .99 | |||
| Binge drinking days | 2.7 (1.9) | 3.0 (1.8) | 2.8 (2.1) | 3.3 (2.1) | 2.8 (2.1) | 3.3 (2.1) | 10.59 (1) | <.001 | 0.30 (2) | .74 | |||
| Drinks per drinking day | 5.1 (3.7) | 5.2 (4.1) | 4.8 (3.8) | 4.9 (4.2) | 4.8 (3.8) | 4.9 (4.2) | 2.43 (1) | .12 | 0.86 (2) | .42 | |||
aICBT: internet-based cognitive behavioral therapy.
bAUDIT: alcohol use disorder identification test.
cAUDIT-C: alcohol use disorder identification test consumption questions.
dICD-10: International Classification of Diseases, Tenth Revision.
eDSM-5: Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition).
fMADRS-S: Montgomery Asberg Depression Rating Scale–Self-rated.
gGAD-7: Generalized Anxiety Disorder Assessment–7 items.
hEQ-5D: EuroQol-5 dimensions.