Table 4.

Analysis of the subgroup based on the studies time range

		N	Sample size	I2	Prevalence (95% CI)
Study time range	1 Year	7	247,424	99.9	8.9 (95% CI 4.5–16.8)
	1–4 Years	6	540,229	99.9	11 (95% CI 8.9–13.5)
	> 4 Years	2	40,290	96.4	29.3 (95% CI 22.1–37.7)
Sex	Man	14	392,835	99.9	6.1 (95% CI 3.6–10)
	Women	14	434,388	99.9	14.2 (95% CI 9.7–20.2)