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Table 3 Perceptions related to easiness in accessibility and permissiveness for consumption

From: Factors associated with crack-cocaine early initiation: a Brazilian multicenter study

Between 15 and 17, how easily did you get: Very easy | Easy Hard | Very hard P-valuea Adjusted p-valueb
Cigarettes (tobacco) (n = 564) 557 (98.7) 7 (1.3)   
Average age (SD, CI 95%) 21.5 (6.89, 20.9–22.0) 24.0 (11.61, 11.8–36.1) 0.382 0.128
Alcohol drinks (n = 564) 547 (97) 17 (3)   
Average age (SD, CI 95%) 21.4 (6.82, 20.8–22.0) 25.5 (9.80, 20.3–30.7) 0.020 0.441
Marijuana (n = 561) 501 (89.3) 60 (10.7)   
Average age (SD, CI 95%) 20.9 (6.62, 20.3–21.5) 26.8 (7.52, 24.8–28.7) < 0.001 0.001
Cocaine (“snorted”) (n = 560) 388 (69.3) 172 (30.7)   
Average age (SD, CI 95%) 20.1 (6.24, 19.4–20.7) 24.9 (7.36, 23.8–26.0) < 0.001 0.816
Crack cocaine (n = 559) 221 (39.5) 338 (60.5)   
Average age (SD, CI 95%) 17.1 (4.21, 16.5–17.6) 24.5 (6.87, 23.7–25.2) < 0.001 < 0.001
During childhood and adolescence, did your parents or caregivers find normal an adolescent: Yes | Partially No P-valuea Adjusted p-valueb
To smoke cigarettes (tobacco)? (n = 519) 131 (25.2) 388 (74.8)   
Average age (SD, CI 95%) 20.9 (7.17, 19.7–22.1) 22.0 (6.81, 21.3–22.7) 0.109 0.192
To drink alcoholic beverages? (n = 520) 154 (29.5) 366 (70.5)   
Average age (SD, CI 95%) 21.4 (6.72, 20.3–22.4) 21.9 (6.96, 22.1–22.6) 0.468 0.866
To get drunk? (n = 520) 70 (13.4) 450 (86.6)   
Average age (SD, CI 95%) 21.2 (6.95, 19.6–22.9) 21.8 (6.90, 21.2–22.5) 0.047 0.949
To smoke marijuana? (n = 521) 18 (3.4) 503 (96.6)   
Average age (SD, CI 95%) 20.7 (7.34, 17.0–24.3) 21.8 (6.89, 21.2–22.4) 0.498 0.783
During childhood / adolescence, how often did your parents / caregivers: Almost everyday | Weekly Monthly | Never P-valuea Adjusted p-valueb
Smoke cigarettes (tobacco) (n = 519) 380 (73.2) 139 (26.8)   
Average age (SD, CI 95%) 22.0 (7.17, 21.3–22.8) 20.8 (6.05, 19.8–21.9) 0.081 0.063
Drink alcoholic beverages (n = 521) 299 (57.3) 222 (42.7)   
Average age (SD, CI 95%) 21.7 (6.64, 20.9–22.4) 21.8 (7.24, 20.9–22.8) 0.799 0.366
Get drunk (n = 519) 187 (36.1) 332 (63.9)   
Average age (SD, CI 95%) 20.9 (6.19, 20.0–21.8) 22.2 (7.22, 21.4–23.0) 0.047 0.034
Smoke marijuana (n = 516) 48 (9.2) 468 (90.8)   
Average age (SD, CI 95%) 20.5 (6.52, 18.6–22.4) 21.9 (6.94, 21.2–22.5) 0.198 0.337
Snorted cocaine (n = 515) 28 (5.4) 487 (94.6)   
Average age (SD, CI 95%) 19.8 (4.99, 17.8–21.7) 21.9 (7.01, 21.2–22.5) 0.122 0.471
Between 15 and 17, how many friends of yours used to: Nobody | A few | Some Majority | Everybody P-valuea Adjusted p-valueb
Smoke cigarettes (tobacco) (n = 557) 216 (38.7) 341 (61.3) 0.001 0.019
Average age (SD, CI 95%) 22.6 (6.97, 21.7–23.6) 20.7 (6.77, 20.0–21.5)
Drink alcohol (n = 557) 201 (37) 356 (63) < 0.001 0.027
Average age (SD, CI 95%) 23.3 (7.57, 22.3–24.4) 20.4 (6.27, 19.8–21.1)
Get drunk (n = 557) 264 (47) 295 (53) < 0.001 0.837
Average age (SD, CI 95%) 22.9 (7.27, 22.0–23.8) 20.2 (6.29, 19.4–20.9)
Have problems related to alcohol use (n = 553) 324 (58.5) 229 (41.5) < 0.001 0.928
Average age (SD, CI 95%) 22.5 (7.32, 21.7–23.4) 20.0 (5.99, 19.3–20.8)
Smoke marijuana (n = 556) 283 (50.9) 273 (49.1) < 0.001 0.109
Average age (SD, CI 95%) 23.0 (7.07, 22.2–23.8) 19.9 (6.36, 19.1–20.6)
Smoke crack cocaine (n = 555) 498 (89.7) 57 (10.3) < 0.001 < 0.001
Average age (SD, CI 95%) 22.2 (6.84, 21.6–22.8) 15.4 (3.89, 14.4–16.4)
  1. SD Standard deviation. CI Confidence Interval. Significant results (p < 0.05) are bolded
  2. at-test for independent variables
  3. bANOVA, analyses adjusted by Bonferroni test