Table 3.
Participant characteristics at baseline and usage of the intervention.
| Characteristics | Factor 1: Chat-based communication | Factor 2: Length | All participants (n=534) | |||||
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No (n=263) | Yes (n=271) | 28 days (n=266) | 50 days (n=268) |
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| Intervention versions | 3, 4 | 1, 2 | 2, 4 | 1, 3 | 1, 2, 3, 4 | |||
| Gender |
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Female, n (%) | 85 (32.3) | 98 (36.2) | 91 (34.2) | 92 (34.3) | 183 (34.3) | ||
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Male, n (%) | 178 (67.7) | 173 (63.8) | 175 (65.8) | 176 (65.7) | 351 (65.7) | ||
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Age, mean (SD) | 27.5 (7.3) | 27.6 (6.7) | 28.2 (7.1) | 26.8 (6.8) | 27.5 (7.0) | ||
| Educational level, n (%) |
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Basic school (Hauptschule) | 25 (9.5) | 29 (10.7) | 30 (11.3) | 24 (9.0) | 54 (10.1) | ||
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Middle school (Realschule) | 64 (24.3) | 57 (21.0) | 61 (22.9) | 60 (22.4) | 121 (22.7) | ||
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High school (Gymnasium) | 165 (62.7) | 181 (66.8) | 167 (62.8) | 179 (66.8) | 346 (64.8) | ||
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Other school | 9 (3.4) | 4 (1.5) | 8 (3.0) | 5 (1.9) | 13 (2.4) | ||
| Cannabis |
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Use daysa, mean (SD) | 24.7 (7.3) | 25.1 (6.5) | 24.9 (7.0) | 24.9 (6.8) | 24.9 (6.9) | ||
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Use eventsa, mean (SD) | 122.5 (111.6) | 120.1 (104.1) | 123.7 (108.9) | 118.9 (106.8) | 121.2 (107.7) | ||
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Quantity (grams)a, mean (SD) | 23.2 (18.8) | 21.3 (18.6) | 23.2 (19.6) | 21.3 (17.8) | 22.2 (18.7) | ||
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SDSb,c, mean (SD) | 9.9 (2.8) | 10.0 (2.7) | 10.1 (2.5) | 9.8 (2.9) | 10.0 (2.7) | ||
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SDSb,c cannabis dependence, n (%) | 260 (98.9) | 266 (98.2) | 265 (99.6) | 261 (97.4) | 526 (98.5) | ||
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Currently no professional help, n (%) | 196 (74.4) | 217 (80.1) | 206 (77.4) | 207 (77.2) | 413 (77.3) | ||
| Usage of the intervention, mean (SD) |
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Number of logins | 25.1 (26.4) | 29.7 (27.2) | 23.2 (20.8) | 31.6 (31.2) | 27.4 (26.9) | ||
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Chat-based counseling (min) | 3.2 (30.1) | 105.3 (43.8) | 53.8 (59.9) | 56.8 (66.9) | 55.3 (63.5) | ||
aDuring the past 30 days.
bSDS: Severity of Dependence Scale.
cCutoff of ≥4 for cannabis dependence [17].