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Table 2 Distribution of past month drug use by age according to group and time point

From: Efficacy evaluation of the school program Unplugged for drug use prevention among Brazilian adolescents

11–12 years

Intervention

Control

Program Effect a

Baseline

4 month follow-up

ORb (95% CI)

p

Baseline

4 month follow-up

ORb (95% CI)

p

ORa (95% CI)

p

N

%

N

%

  

N

%

N

%

    

 Tobacco

1/296

0.3

3/296

1.0

Non-estimable

 

0/384

0.0

0/384

0.0

Non-estimable

 

Non-estimable

 

 Alcohol

19/251

7.6

19/251

7.6

1.00 (0.32;3.14)

. > 0.999

18/349

5.2

20/349

5.7

1.45 (0.43;4.83)

0.529

0.67 (0.12;3.77)

0.646

 Binge drinking

12/226

5.3

15/226

6.6

1.81 (0.51;6.44)

0.345

5/325

1.5

11/325

3.4

6.33 (0.91; 43.95

0.054

0.25 (0.17;1.54)

0.327

 Marihuana

0/249

0.0

2/249

0.8

Non-estimable

 

1/378

0.3

4/378

1.1

Non-estimable

 

Non-estimable

 

 Inhalants

2/246

0.8

4/246

1.6

2.50 (0.34;18.30)

0.367

1/378

0.3

5/378

1.3

6.63 (0.62;70.63)

0.117

0.38 (0.02;7.73)

0.527

 Cocaine

0/246

0.0

1/246

0.4

Non-estimable

 

0/377

0.0

0/377

0.0

Non-estimable

 

Non-estimable

 

 Crack

0/246

0.0

0/246

0.0

Non-estimable

 

0/377

0.0

0/377

0.0

Non-estimable

 

Non-estimable

 

13–15 years

 Tobacco

11/441

2.5

15/441

3.4

2.10 (0.62;7.20)

0.235

17/547

3.1

17/547

3.1

1.00 (0.32;3.11)

>0.99

1.45 (0.34;6.25)

0.615

 Alcohol

59/370

15.9

71/370

19.2

1.52 (0.90;2.56)

0.116

80/460

17.4

88/460

19.1

1.26 (0.79;2.01)

0.341

1.38 (0.76;2.50)

0.289

 Binge drinking

40/340

11.8

38/340

11.2

0.89 (0.47;1.71)

0.742

45/424

10.6

63/424

14.9

2.05 (1.16;3.63)

0.014

0.43 (0.31;1.46)

0.581

 Marihuana

7/432

1.6

13/432

3.0

2.41 (0.79;7.33)

0.120

7/546

1.3

15/546

2.7

3.21 (1.00;10.28)

0.050

0.75 (0.16;3.61)

0.722

 Inhalants

10/430

2.3

7/430

1.6

0.61 (0.19;1.91)

0.393

10/540

1.9

13/540

2.4

1.46 (0.54;3.96)

0.455

0.41 (0.09;1.91)

0.259

 Cocaine

0/431

0.0

5/431

1.2

Non-estimable

 

1/544

0.2

5/544

0.9

11.96 0.55;259.45)

0.114

Non-estimable

 

 Crack

0/433

0.0

6/433

1.4

Non-estimable

 

1/545

0.2

5/545

0.9

11.49 (0.57;230.50)

0.111

Non-estimable

 
  1. aOR for the multilevel analysis gllamm - intervention x control at 4 month follow-up adjusted for sex and baseline prevalence of drug use
  2. b OR for the multilevel analysis gllamm, 4 month follow up x baseline, in each group (or intervention or control), adjusted by sex
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