A simple questionnaire to detect chronic kidney disease patients from Long An province screening data in Vietnam

Table 1 Demographic data

Variable	N	Mean ± SD or %
Age (years)	2037	42.3 ± 14.2
19 to 29	423	20.8%
30 to 39	604	29.6%
40 to 49	367	18.0%
50 to 59	385	18.9%
60 to 69	167	8.2%
More than 70	91	4.5%
Men (n, %)	929	45.6%
Height (cm)	2037	158.5 ± 8.2
Weight (kg)	2037	54.9 ± 9.6
Body mass index (kg/m²)	2037	21.5 ± 3.3
Waist circumference (cm)	2037	74.1 ± 9.1
Hip circumference (cm)	2037	88.8 ± 7.0
Waist hip ratio	2037	0.82 ± 0.1
Increased waist circumference (n, %)	323	15.8%
Hypertension on screening (n, %)	577	28.3%
Mean blood pressure (mmHg)	2037	95.4 ± 13.5
Serum creatinine (mg/dL)	2037	0.89 ± 0.29
eGFR _MDRD (ml/min/1.73 m²)	2037	87.7 ± 15.8
Albumin/creatinine ratio (mg/g)*	2037	8.89 [4.75, 15.38]

Body mass index = Weight (Kg)/(Height)(m)², Waist hip ratio = Waist (cm)/hip (cm), Increased waist circumference was defined by waist circumference > 90 cm (men) or > 80 cm (women), Hypertension at screening was defined as mean systolic blood pressure ≥ 140 mmHg, or diastolic blood pressure ≥ 90 mmHg on three measurements
* Median [25%, 75%]