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Table 6 Substance use of participants who responded to the custom research company hired at the fourth TRAILS measurement wave (T4-easy-to-recruit), participants who responded after extra recruitment effort of the TRAILS research team (T4-hard-to-recruit), participants who did not respond at the fourth wave but did participate in the third wave (non-responder T4) and of participants who had dropped out from TRAILS prior to the fourth wave (drop-out since T2 or T3)
| T4-easy-to-recruit (ref.) | T4-hard-to-recruit | Non-responder T4 | Drop-out since T2 or T3 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| n(%) | n(%) | OR | 95% CI | n(%) | OR | 95% CI | n(%) | OR | 95% CI | |
| Lifetime substance use | ||||||||||
| T2 Tobacco lifetime prevalence | 533 (33.7) | 107 (44.0) | 1.55* | 1.18-2.03 | 62 (50.8) | 2.03* | 1.40-2.94 | 56 (39.7) | 1.30 | 0.91-1.84 |
| T2 Alcohol lifetime prevalence | 1,162 (73.9) | 194 (79.8) | 1.40* | 1.00-1.95 | 92 (76.7) | 1.16 | 0.75-1.80 | 103 (72.5) | 0.93 | 0.64-1.37 |
| T2 Cannabis lifetime prevalence | 100 (6.3) | 28 (11.6) | 1.94* | 1.25-3.02 | 11 (9.3) | 1.52 | 0.79-2.92 | 14 (10.1) | 1.65 | 0.92-2.98 |
| T3 Tobacco lifetime prevalence | 819 (57.1) | 89 (70.6) | 1.81* | 1.21-2.69 | 69 (70.4) | 1.79* | 1.14-2.79 | - | ||
| T3 Alcohol lifetime prevalence | 1,345 (93.9) | 125 (98.4) | 4.04 | 0.98-16.62 | 92 (93.9) | 0.99 | 0.42-2.33 | - | ||
| T3 Cannabis lifetime prevalence | 439 (30.7) | 45 (35.4) | 1.24 | 0.85-1.81 | 35 (36.5) | 1.29 | 0.84-1.99 | - | ||
| T4 Tobacco lifetime prevalence | 1,153 (72.7) | 100 (81.3) | 1.64* | 1.03-2.61 | - | - | ||||
| T4 Alcohol lifetime prevalence | 1,146 (98.2) | 121 (99.2) | 2.27 | 0.31-16.81 | - | - | ||||
| T4 Cannabis lifetime prevalence | 841 (53.1) | 66 (55.0) | 1.08 | 0.75-1.57 | - | - | ||||
