Table 2. Prevalence of functional impairment across three levels: comparisons by sex, residential region, and age group.

Subgroup	2011	2014	2018	Average annual growth rate (%)
Note: mild impairment was defined as having 1 or more activities of daily living (ADL) activities with “partial independence” but none of the 6 ADL activities with “complete dependence on others”; moderate impairment was defined as having 1 to 2 ADL activities with “complete dependence on others”; severe impairment was defined as experiencing “complete dependence on others” for three or more ADL activities.
Overall functional impairment (%)	13.10	13.46	10.91	−0.0257
Urban	14.40	15.91	11.79	−0.0281
Rural	11.66	11.23	9.98	−0.0220
Male	12.09	12.11	9.47	−0.0342
Female	14.31	15.10	12.49	−0.0193
65–74 years	6.30	5.97	3.78	−0.0705
75–84 years	13.28	13.61	9.74	−0.0432
85+ years	39.59	36.16	42.28	0.0095
Mild impairment (%)	4.29	4.33	3.01	−0.0496
Urban	4.29	4.87	3.20	−0.0410
Rural	4.30	3.84	2.80	−0.0593
Male	4.14	3.75	2.81	−0.0537
Female	4.48	5.04	3.22	−0.0462
65–74 years	2.93	2.52	1.24	−0.1149
75–84 years	4.59	5.00	3.60	−0.0341
85+ years	8.92	7.96	8.80	−0.0018
Moderate impairment (%)	6.49	6.33	5.72	−0.0177
Urban	7.46	7.65	6.32	−0.0235
Rural	5.41	5.13	5.10	−0.0085
Male	5.76	5.86	5.04	−0.0191
Female	7.35	6.90	6.48	−0.0180
65–74 years	2.73	2.28	1.95	−0.0473
75–84 years	6.53	6.19	4.74	−0.0448
85+ years	21.25	19.28	23.13	0.0122
Severe impairment (%)	2.32	2.80	2.18	−0.0087
Urban	2.65	3.39	2.28	−0.0216
Rural	1.95	2.26	2.08	0.0093
Male	2.19	2.50	1.63	−0.0417
Female	2.47	3.16	2.79	0.0174
65–74 years	0.64	1.18	0.58	−0.0132
75–84 years	2.15	2.41	1.40	−0.0595
85+ years	9.42	8.93	10.35	0.0135