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Table 3 Comparison of patients with and without capacity to consent to research

From: Decision-making capacity for research participation among addicted people: a cross-sectional study

Variable

Capacity present

Capacity absent

P Value

(n = 35)

(n = 17)

Age, years (mean ± SD)

42.3 (11.3)

44.9 (11.2)

.545a

Women (%)

86.7

13.3

.045 b

Men (%)

59.5

40.5

Marital Status (%)

  

.239 b

 Married/cohabiting

75

25

 Never married

78.6

21.4

 Previous married

54.5

45.5

Living status (%)

  

.041 b

 Alone

75

25

 With family

75

25

 Parents/Institution

55

45

Education level (%)

  

.033 b

 Primary

55.3

46.7

 Secondary

82.4

17.6

 University degree

100

0

Employment status (%)

  

.198 b

 Employed

72.7

27.3

 Unemployed

52.2

47.8

 Retired

85.7

14.3

 Disabled person

81.8

18.2

Psychiatric diagnoses (%)

  

.668 b

 Psychotic disorders

55.6

44.4

 Mood Disorders

78.6

21.4

 Anxiety disorders

62.5

37.5

 No psychiatric diagnosis

69.2

30.8

CGI (%)

  

<.006 b

 Less than moderately ill

100

0

 Moderately ill or more

57.5

42.5

GAF (range, 0–100) (mean ± SD)

70.2 (16.7)

57.6 (8.1)

.003 a

Length of illness, years (mean ± SD)

12.9 (10.1)

18.5 (10.5)

.056 a

Psychiatric Admissions (mean ± SD)

0.9 (1.5)

1.4 (3.4)

.782 a

Therapeutic Community Admisisons (mean ± SD)

0.26 (0.6)

0.75 (1.1)

.058 a

MMSE scores (range, 0–30) (mean ± SD)

29.1 (1.3)

28.1 (1.4)

.007 a

Group (%)

  

.435 b

 Alcohol

50

50

 THC

81.8

18.2

 Cocaine

70

30

 Alcohol + other

68.4

31.6

MacCAT-CR ( mean ± SD)

   

Understanding subscale score (range, 0–26)

23.0 (1.9)

15.2 (3.3)

<.001 a

Appreciation subscale score (range, 0–6)

5.4 (1.0)

4.3 (1.5)

.008 a

Reasoning subscale score (range, 0–8)

6.7 (1.2)

5.1 (1.9)

.002 a

Expression of a choice subscale score (range, 0–2)

1.9 (0.2)

1.8 (0.6)

.164 a

  1. Abbreviations: SD, standard deviation; CGI, Clinical Global Impression; GAF, Global Assessment of Functioning; MMSE, Mini-Mental State Examination; THC, Tetra hidro cannabinol; SUD, Substance use disorders; MacCAT-CR, MacArthur Competence Assessment Tool for Clinical Research
  2. a Mann–Whitney U
  3. b Pearson’s χ2