Table 1 The characteristics of Studies that evaluation the relationship between methamphetamine uses and multiple sexual partners in MSM

Piyaraj et al. (2018) [19]

Thailand

Cohort

1372 MSM

60

Volunteered ^{Self−selected men}

Self-reported

Total:26

1–5

786 (57%)

HR: 2.7 (95% CI: 0.6–11)

Increase

18–21

264 (19%)

22–29

724 (53%)

 ≥ 6

522 (38%)

HR: 9.7 (95% CI: 2.4–39.7)

Increase

 ≥ 30

384 (28%)

Planky et al. (2007) [20]

USA

Cohort

4003 MSM

84

Volunteered ^{Self−selected men}

Self-reported

Total:33.4

1

HR: 2.71 (95% CI: 1.81–4.04)

Increase

18–25

672 (17%)

26–35

1795 (45%)

2–4

HR: 7.79 (95% CI: 5.17–11.74)

Increase

36–45

1148 (28%)

46–55

323 (8%)

 ≥ 5

HR: 13.57(95% CI: 8.43–21.84)

Increase

56 + 

65 (2%)

Hirshfield et al. (2004) [21]

USA

A Nested Case–Control

2643 MSM

-

Volunteered ^{Self−selected men}

Self-reported

Total: 33

2–5

1103(%44)

OR: 1.6 (95% CI: 0.6 -3. 9)

Increase

18–29

1218(46.08)

30–39

728(27.54)

 ≥ 6

888 (%36)

OR: 3.3 (95% CI: 1.4- 7.8)

Increase

40 + 

697(26.37)

Drumright et al. (2009) [22]

USA

Case–Control

145 MSM

-

Volunteered ^{Self−selected men}

Self-reported

Total:32.4

3

OR: 2.77 (95% CI: 1.2–6.6)

Increase

Brown et al. (2017) [23]

USA

Case–Control

75 MSM

-

Volunteered ^{Self−selected men}

Self-reported

Total: 42.8

1

OR: 5.7 (95% CI: 1.7– 19.3)

Increase

Total: 40.7

 > 1

OR: 10.5 (95% CI: 2.2– 50.6)

Increase

Hoenigl et al. (2015) [17]

USA

Cohort

6676 MSM

12

Random

Rapid Test

Total: 32

 > 5

OR: 3.19 (95% CI: 2.52– 4.02)

Increase

Prestage et al. (2009) [18]

Australia

Cohort

746 MSM

12

Volunteered

Self-reported

Total: 39.8

 > 4

OR: 1.98 (95% CI: 1.23- 3.19)

Increase

Fernandez et al. (2007) [24]

USA

Case–Control

566 MSM

-

Random

Self-reported

Total: 30.86

 > 1

OR: 1.038 (95% CI 1.017–1.06)

Increase