Table 3.

Age-standardized prevalence of prediabetes among study participants from 2011 to 2017 (n=12,725)¹

Characteristics		2011	2012	2013	2014	2015	2016	2017	APC (%)	ptrend
No. of respondents (n)		1,530	2,998	3,982	994	1,251	981	989	-	-
No. of participants with prediabetes (n)		469	632	1,248	540	659	489	522	-	-
Prevalence overall
	Crude	30.7±1.2	21.1±0.7	31.3±0.7	54.3±1.6	52.7±1.4	49.8±1.6	52.8±1.6	15.24	<0.001
	Adjusted	29.4±1.3	20.2±0.8	30.6±0.8	53.4±1.7	53.3±1.5	48.7±1.7	52.9±1.6	16.17	<0.001
Age (yr)
	45–49	25.4±2.6	19.4±1.4	29.5±1.4	49.2±3.3	52.2±2.8	46.1±3.0	47.5±2.9	14.54	<0.001
	50–54	29.1±2.5	18.1±1.6	30.2±1.8	54.4±3.7	56.6±3.1	46.9±4.0	56.5±3.6	21.24	<0.001
	55–59	32.6±2.7	19.4±1.6	29.3±1.7	56.8±3.3	52.7±3.0	50.6±3.8	57.8±3.5	16.64	<0.001
	60–64	33.7±3.0	24.3±2.0	33.0±2.0	53.8±4.0	56.2±3.6	53.6±3.7	53.5±4.0	17.29	<0.001
	65–69	32.4±2.4	25.9±1.9	34.7±1.5	58.2±3.5	45.5±3.5	53.4±3.6	50.8±4.4	16.28	<0.001
Gender
	Women	31.1±1.5	22.3±0.9	33.3±1.0	55.6±2.0	54.2±1.7	50.3±2.0	52.8±1.9	14.09	<0.001
	Men	24.8±2.3	14.5±1.3	23.9±1.4	48.1±3.3	51.0±3.0	44.5±3.4	53.4±3.3	12.75	<0.001
Educational level
	Illiteracy to secondary school (grade 9 and below)	31.4±1.8	20.6±1.0	31.3±1.1	53.8±2.5	55.5±1.9	49.8±2.2	55.3±2.2	16.68	<0.001
	High school (grade 10-12)	27.7±2.2	19.3±1.5	30.4±1.5	52.6±2.9	49.8±2.8	46.5±3.3	48.7±3.0	14.65	<0.001
	College or more	26.8±3.2	21.5±2.2	28.0±2.1	56.7±3.8	51.0±4.3	49.4±4.8	50.9±4.7	16.57	0.1
Region
	Rural	NA	18.2±1.2	34.0±1.6	NA	NA	47.8±2.4	57.6±2.3	NA	NA
	Urban	29.3±1.3	21.4±1.0	29.2±0.9	53.3±1.7	53.3±1.5	49.7±2.5	48.4±2.3	16.37	<0.001

Values are presented as %±standard error.

APC, annual percent change; NA. not applicable.

¹Direct age adjustment of the data was done for the Vietnamese population aged ≥45 years in the year 2009.