Table 2.

Pooled prevalence of disability and subgroup analyses.

Variables	Classification	Number of Studies	Number of Results	Event Rate (%)	95% CI (%)	Heterogeneity I2 (%)	Q-Value	p-Value
Pooled prevalence		97	110	26.2	23.7–28.6	99.9	81,405.53
Type of ADL	BADL	56	62	20.5	17.7–23.3	99.9	26.55	<0.001
	IADL	7	7	31.8	21.2–42.4	99.9
	BADL + IADL	41	41	33.8	29.4–38.3	99.6
Gender	Male	53	60	22.7	20.0–25.5	99.7	5.35	0.021
	Female	53	60	28.5	24.5–32.5	99.8
Age group	60–69	23	26	12.8	10.1–15.5	99.6	104.92	<0.001
	70–79	23	26	22.4	16.5–28.3	99.7
	≥80	36	44	36.8	33.1–40.5	99.6
Region	Eastern China	32	33	27.0	22.3–31.7	99.8	2.44	0.786
	Northern China	18	20	26.0	19.9–32.1	99.7
	Southern China	6	6	24.2	8.0–40.3	99.7
	Central China	7	7	26.9	17.9–35.8	99.4
	Southwest China	10	13	30.9	22.3–39.4	99.7
	Northwest China	4	4	21.3	12.3–30.3	97.8
Hukou	Urban	17	22	22.4	16.9–27.9	99.9	2.13	0.143
	Rural	26	31	28.0	22.9–33.0	99.9
Survey year	1999 and before	5	6	21.4	10.4–32.4	99.8	2.16	0.706
	2000–2004	6	7	23.7	13.0–34.3	99.8
	2005–2009	10	12	29.1	21.6–36.7	99.7
	2010–2014	41	43	27.7	23.6–31.8	99.8
	2015–2019	36	38	25.3	20.9–29.7	99.9