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Table 3 Logistic regression analysis on harm experiences and mental health among different GBMSM chemsex groups

From: Experiences of harm and mental ill-health among gay, bisexual and other men-who-have-sex-with-men who use methamphetamine or GHB/GBL in different combinations: findings from the COMeT study in Taiwan

 

Univariable

Multivariate multivariable

Model 1a

Model 2b

Model 3c

OR (95% CI)

p-value

OR (95% CI)

p-value

OR (95% CI)

p-value

OR (95% CI)

p-value

Harm experienced after a chemsex session

 

 Any physical experiences

        

  M+G− versus M−

3.35 (2.07–5.43)

 < 0.001*

2.85 (1.72–4.73)

 < 0.001*

3.05 (1.83–5.08)

 < 0.001*

2.75 (1.47–5.15)

0.002*

  M+G+ versus M−

7.12 (4.30–11.76)

 < 0.001*

6.05 (3.50–10.45)

 < 0.001*

5.67 (3.27–9.83)

 < 0.001*

5.85 (2.94–11.64)

 < 0.001*

 Any social experiences

        

  M+G− versus M−

3.85 (2.38–6.22)

 < 0.001*

3.35 (2.02–5.54)

 < 0.001*

3.52 (2.11–5.87)

 < 0.001*

2.09 (1.12–3.90)

0.021

  M+G+ versus M−

9.43 (5.53–16.07)

 < 0.001*

7.29 (4.12–12.91)

 < 0.001*

6.91 (3.88–12.29)

 < 0.001*

4.11 (2.04–8.27)

 < 0.001*

 Any psychological experiences

        

  M+G− versus M−

4.43 (2.70–7.28)

 < 0.001*

3.94 (2.34–6.65)

 < 0.001*

4.23 (2.48–7.22)

 < 0.001*

3.51 (1.80–6.85)

 < 0.001*

  M+G+ versus M−

11.71 (6.48–21.16)

 < 0.001*

9.15 (4.87–17.21)

 < 0.001*

8.61 (4.56–16.26)

 < 0.001*

6.55 (3.00–14.33)

 < 0.001*

Mental health indicators

 

 Mood−related problems

        

  M+G− versus M−

1.48 (0.90–2.43)

0.126

1.29 (0.75–2.23)

0.358

1.30 (0.75–2.24)

0.353

0.89 (0.45–1.77)

0.737

  M+G+ versus M−

2.30 (1.41–3.74)

0.001*

1.80 (1.03–3.14)

0.038

1.79 (1.02–3.14)

0.042

0.97 (0.47–2.00)

0.941

 Suicide ideation

        

  M+G− versus M−

1.92 (1.08–3.41)

0.027

1.75 (0.95–3.24)

0.075

1.80 (0.97–3.33)

0.064

1.50 (0.72–3.16)

0.282

  M+G+ versus M−

2.82 (1.61–4.93)

 < 0.001*

2.40 (1.28–4.50)

0.006*

2.30 (1.22–4.35)

0.010

1.91 (0.87–4.16)

0.106

 Loneliness

        

  M+G− versus M−

2.98 (1.07–8.28)

0.036

2.21 (0.75–6.49)

0.148

1.76 (0.58–5.34)

0.315

0.80 (0.22–2.94)

0.742

  M+G+ versus M−

3.16 (1.14–8.78)

0.027

1.55 (0.49–4.91)

0.457

2.25 (0.65–7.82)

0.201

1.01 (0.23–4.49)

0.991

 Sexual well−being

        

  M+G− versus M−

0.75 (0.42–1.35)

0.344

0.88 (0.47–1.63)

0.675

0.95 (0.51–1.78)

0.866

1.14 (0.52–2.46)

0.746

  M+G+ versus M−

0.91 (0.50–1.64)

0.755

1.02 (0.53–1.98)

0.948

0.89 (0.45–1.74)

0.734

0.78 (0.34–1.80)

0.558

  1. GBMSM, gay, bisexual, and other men-who-have-sex-with-men; OR, odds ratio; CI, confidence interval; M−, chemsex individuals who did not use methamphetamine in the past six months; M+G−, chemsex individuals who use methamphetamine but not GHB/GBL in the past six months; M+G+, chemsex individuals who used both methamphetamine and GHB/GBL in the past six months
  2. aAfter controlling for age, income, number of partners, and infection with human immunodeficiency virus or sexually transmitted infections
  3. bAfter controlling for variables which were controlled for in Model 1 and polydrug use excluding methamphetamine nor GHB/GBL
  4. cAfter controlling for variables which were controlled for in Model 2 and frequency of using methamphetamine and GHB/GBL
  5. *p < 0.007 (Bonferroni's adjusted alpha level for multiple comparisons αalter = 0.05/7 = 0.00714)
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