Table 3 Subgroup analysis based on fixed-effects models for the association between methamphetamine and multiple sex partner

Methamphetamine based on multiple sex partner

 Overall

13

96.64

 < 0.001

3.70 (2.04–6.70)

 Number of Sexual Partners

1 to 3

5

90.66

 < 0.001

2.82 (1.30—6.11)

 < 0.001

4 to 5

4

86.63

 < 0.001

2.98 (1.19 -7.47)

6 or more

4

90.10

 < 0.001

5.89 (2.37–14.65)

 Country

USA

10

97.35

 < 0.001

3.77 (1.89 -7.53)

 < 0.001

Non-US countries

3

55.09

0.110

3.17 (1.26—8.00)

 Sample size

Under 1000 Sample

5

85.72

 < 0.001

2.52 (1.25–5.09)

 < 0.001

1000 Sample or above

8

85.43

 < 0.001

4.44 (2.66–7.40)

 Age

26–33

7

94.64

 < 0.001

2.55 (1.31–4.93)

 < 0.001

Greater than 33

6

89.60

 < 0.001

5.38 (2.65–10.92)