Table 3.

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

		Number of effect sizes	(I2)1	P2	RR (95%CI)3	P-be4
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)

Abbreviation: RR Relative risk

¹Inconsistency, percentage of variation across studies due to heterogeneity

²Obtained from the Q-test

³Obtained from the fixed-effects model

⁴Heterogeneity between groups