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. 2021 Nov 3;23(11):e31274. doi: 10.2196/31274

Table 4.

Logistic regression models predicting study retention with all patients: online therapy in the equivalence study (ONL1), face-to-face therapy in the equivalence study (F2F), online therapy in superiority study (ONL2), care as usual in the superiority study (CAU).

Variables Model 0 T2a Model 1 T2 Model 2 T2 Model 1 T3b Model 2 T3

ORc (95% CI) P value OR (95% CI) P value OR (95% CI) P value OR (95% CI) P value OR (95% CI) P value
Intervention group










ONL1 vs CAU 0.77 (0.39- 1.50) .44 0.75 (0.38-1.50) .42 0.74 (0.37-1.52) .43 1.79 (0.83-3.86) .14 1.82 (0.82-4.03) .14

F2F vs CAU 1.06 (0.56-2.03) .86 1.05 (0.54-2.05) .88 1.14 (0.57-2.28) .71 1.93 (0.92-4.07) .08 2.10 (0.96-4.59) .06

ONL2 vs CAU 0.77 (0.39-1.52) .45 0.75 (0.37-1.53) .43 0.78 (0.38-1.64) .52 1.29 (0.58-2.88) .54 1.32 (0.57-3.07) .52
Age N/Ad N/A 1.02 (0.99-1.04) .21 1.02 (0.99-1.04) .28 1.03 (0.99-1.06) .06 1.03 (1.00-1.06) .08
Gender










Female N/A N/A 1 N/A 1 N/A 1 N/A 1 N/A

Male N/A N/A 1.15 (0.70-1.90) .58 1.22 (0.72-2.07) .45 1.00 (0.58-1.71) .99 1.01 (0.57-1.78) .98
Marital status










Unmarried N/A N/A 1 N/A 1 N/A 1 N/A 1 N/A

Married N/A N/A 1.55 (0.94-2.57) .09 1.80 (1.05-3.08) .03 1.47 (0.85-2.52) .17 1.78 (1.00-3.20) .05
Educational level










Elementary school N/A N/A 1 N/A 1 N/A 1 N/A 1 N/A

High school N/A N/A 0.89 (0.48-1.66) .72 1.02 (0.53-1.98) .95 0.85 (0.43-1.70) .65 0.96 (0.46-2.00) .91

College and above N/A N/A 1.42 (0.81-2.49) .22 1.63 (0.90-2.96) .11 1.28 (0.70-2.35) .42 1.50 (0.79-2.85) .22

Other N/A N/A 0.75 (0.12-4.82) .76 0.68 (0.10-4.62) .70 2.23 (0.18-8.19) .83 1.07 (0.15-7.78) .95
Employment status










Unemployed N/A N/A 1 N/A 1 N/A 1 N/A 1 N/A

Employed N/A N/A 1.13 (0.62-2.05) .70 1.13 (0.60-2.12) .71 1.51 (0.77-2.95) .23 1.68 (0.82-3.45) .16
Income status (€e)










<1500 N/A N/A 1 N/A 1 N/A 1 N/A 1 N/A

1500-3000 N/A N/A 0.96 (0.53-1.76) .91 0.91 (0.48-1.72) .78 1.04 (0.54-1.99) .92 1.06 (0.53-2.12) .87

>3000 N/A N/A 0.76 (0.37-1.56) .45 0.78 (0.36-1.66) .51 0.58 (0.26-1.28) .18 0.63 (0.27-1.46) .28
Somatoform complaints N/A N/A N/A N/A 0.97 (0.67-1.38) .84 N/A N/A 0.91 (0.61-1.35) .64
Depressiveness N/A N/A N/A N/A 0.55 (0.35-0.87) .01 N/A N/A 0.56 (0.37-0.92) .02
Phobic fear N/A N/A N/A N/A 1.15 (0.81-1.64) .42 N/A N/A 1.30 (0.88-1.93) .18
Mental well-being N/A N/A N/A N/A 1.47 (0.90-2.40) .13 N/A N/A 1.63 (0.95-2.80) .07
Interactional difficulties N/A N/A N/A N/A 1.21 (0.87-1.68) .26 N/A N/A 1.29 (0.90-1.86) .16
Self-efficacy N/A N/A N/A N/A 0.57 (0.37-0.89) .01 N/A N/A 0.52 (0.32-0.85) .01
Activity and participation N/A N/A N/A N/A 1.25 (0.85-1.83) .26 N/A N/A 1.06 (0.70-1.60) .80
Social stress N/A N/A N/A N/A 0.85 (0.60-1.21) .37 N/A N/A 0.71 (0.48-1.06) .09
Social support N/A N/A N/A N/A 0.79 (0.58-1.08) .14 N/A N/A 0.68 (0.48-0.96) .03
Work ability index N/A N/A N/A N/A 0.98 (0.76-1.27) .89 N/A N/A 0.96 (0.72-1.27) .75
Nagelkerke .007 .646 .043 .62 .119 .05 .067 .272 .197 .004

aT2: 12-month follow-up measurement for the equivalence study; 9-month follow-up measurement for the superiority study.

bT3: 18-month follow-up measurement for the equivalence study; 15-month follow-up measurement for the superiority study.

cOR: odds ratio.

dN/A: not applicable.

eA currency exchange rate of €1=US $1.16 is applicable.