Table 1. Characteristics Of 22 Cross-Sectional Studies, Reporting Prevalence Of Prehypertension.

First author, publication year	Country	Sample size	Gender (male %)	Age (year)	Prevalence of prehypertension (%)	Methods of BP measurement	Criteria for prehypertension
Aekplakorn 200811	China	39290	48.2	≥ 15	32.8	mercury sphygmomanometer	JNC7
Agyemang 200712	Netherlands	1432	41.1	35–60	32.8	automated digital BP device	JNC7
Agyemang 200813	Ghana	1431	45	≥ 18	40.0	automated digital BP device	JNC7
Chockalingam 200514	India	2007	75	18–86	47.4	mercury sphygmomanometer	JNC7
Choi 200615	Korea	6074	43.1	≥ 20	31.6	mercury sphygmomanometer	JNC7
Erem 200916	Turkey	4809	45.9	≥ 20	14.5	aneroid sphygmomanometer	JNC7
Ferguson 200817	Jamaica	1972	33.5	15–74	30.0	NA	JNC7
Glasser 201018	US	9799	49.8	≥ 45	56.7	aneroid sphygmomanometer	JNC7
Gupta 201019	US	10380	52.3	≥ 20	36.3	mercury sphygmomanometer	JNC7
Isezuo 201020	Nigeria	782	52.3	15–65	58.7	automated sphygmomanometer	JNC7
Ishikawa 200821	Japan	12048	39.1	18–90	33.0	automated digital BP device	JNC7
Janghorbani 200822	Iran	69722	50.3	25–65	52.1	mercury sphygmomanometer	JNC7
Kawamoto 200823	Japan	2841	42.5	19–90	25.3	automated digital BP device	JNC7
Li 200824	China	2589	41.1	20–84	38.4	mercury sphygmomanometer	JNC7
Lin 200925	China	6204	42.7	61.7 ± 11.9	30.2	mercury sphygmomanometer	JNC7
Ling 200826	China	5272	48.2	≥ 15	36.3	mercury sphygmomanometer	JNC7
Sit 201027	China	1448	54.4	35–74	42.7	mercury sphygmomanometer	JNC7
Sun 200728	China	29970	50.5	35–99	47.0	electric sphygmomanometer	JNC7
Tsai 200529	China	2225	46.7	18–96	34.0	standardized sphygmomanometer	JNC7
Yadav 200830	India	1112	50.1	49.8 ± 11.5	32.3	mercury sphygmomanometer	JNC7
Yang 201031	China	20167	38.5	35–74	54.6	mercury sphygmomanometer	JNC7
Yu 200832	China	10748	47.0	35–74	21.9	mercury sphygmomanometer	JNC7

NA = not available; BP = blood pressure.