Expert evaluation of language equivalence (n = 5)_
| Instrument | Total items | Language comparability (mean, range) | Interpretability Similarity (Mean, Range) |
|---|---|---|---|
| DrInC | 50 | 1.50 (1.00-2.00) | 1.34 (1.00-2.00) |
| PBSS-20 | 20 | 1.43 (1.00-2.00) | 1.27 (1.00-2.00) |
Psychometric properties of the Vietnamese DrInC and PBSS-20_
| Instrument | I-CVI range | S-CVI | ICC type | ICC (95% CI) | ICC interpretation | Cronbach’s alpha | Internal consistency | Corrected item-total correlation (range) | Cronbach’s alpha if item deleted | Split-half reliability (Spearman-Brown) |
|---|---|---|---|---|---|---|---|---|---|---|
| DrInC | 0.80-1.00 | 0.97 | Single measures | 0.95* (0.89, 0.98) | Excellent | 0.75 | Acceptable | -0.08 to 0.58 | 0.74 to 0.76 | 0.67 |
| Average measures | 0.97* (0.94, 0.99) | Excellent | ||||||||
| PBSS-20 | 0.80-1.00 | 0.95 | Single measures | 0.75* (0.53, 0.88) | Good | 0.79 | Acceptable | -0.12 to 0.60 | 0.76 to 0.81 | 0.67 |
| Average measures | 0.86* (0.70, 0.93) | Good |
Demographic characteristics of study participants_
| Variable | Pilot study (n = 30) | Main study (n = 104) |
|---|---|---|
| Age (years), Mean (SD) | 39.23 ± 2.57 | 39.53 ± 2.85 |
| Marital status, n (%) | ||
| Single | 1 (3.30) | 15 (14.40) |
| Married | 29 (96.70) | 89 (85.60) |
| Education level, n (%) | ||
| Primary school | 12 (40.00) | 21 (20.20) |
| Secondary school | 15 (50.00) | 54 (51.90) |
| High school or higher | 3 (10.00) | 29 (27.90) |
| Occupation, n (%) | ||
| Officer and own businessman | 2 (6.70) | 4 (3.90) |
| Worker | 5 (16.70) | 19 (18.30) |
| Laborer | 2 (6.70) | 17 (16.30) |
| Farmer | 21 (70.00) | 64 (61.50) |
| Monthly Income (USD), Median (IQR) | 116.69 (133.37) | 155.58 (116.69) |
| Low (≤116.68), n (%) | 11 (36.70) | 21 (20.20) |
| Middle (116.69-155.58), n (%) | 9 (30.00) | 37 (35.57) |
| High (≥155.59), n (%) | 10 (33.30) | 46 (44.23) |
| Age of first drink (years), Mean (SD) | 19.20 ± 2.11 | 19.45 ± 2.63 |
| Early (≤17), n (%) | 3 (10.00) | 17 (16.30) |
| Typical (18-20), n (%) | 23 (76.70) | 65 (62.50) |
| Late (≥21), n (%) | 4 (13.30) | 22 (21.20) |
| Family history of alcohol use, n (%) | ||
| Yes | 20 (66.70) | 48 (46.20) |
| No | 10 (33.30) | 56 (53.80) |
Alcohol-related problems and protective behavioral strategies (main study) (n = 104)_
| Variable | Mean ± SD |
|---|---|
| Alcohol-related problems (DrInC, Mean [SD]) | 25.17 ± 7.83 |
| Physical | 5.69 ± 2.03 |
| Interpersonal | 5.45 ± 2.33 |
| Intrapersonal | 5.41 ± 2.42 |
| Impulse control | 4.85 ± 2.72 |
| Social responsibility | 3.77 ± 1.20 |
| Protective behavioral strategies (PBSS, Mean [SD]) | 78.43 ± 14.15 |
| MOD | 21.71 ± 6.06 |
| SLD | 20.63 ± 5.52 |
| SHR | 36.10 ± 6.77 |