Highlighting of Urinary Sodium and Potassium among Indonesian Schoolchildren Aged 9–12 Years: The Contribution of School Food

Table 1

Baseline characteristics of the study participants ().

Variable	Frequency or mean ± SD	Percentage
Age (years)	10.15 ± 0.77
9-10	104	67.1
11-12	51	32.9
Gender
Boys	80	51.6
Girls	75	48.4
School grade
4th grade	96	62
5th grade	59	38
Body weight (kg)	39.84 ± 11.84
Body height (cm)	141.73 ± 7.6
BMI (kg/m^2)	19.53 ± 4.4
Nutritional status (BMI z-score)	0.69 ± 1.64
Underweight	10	6.5
Normal weight	68	43.9
Overweight	40	25.8
Obesity	37	89.67
Pocket money (Rp)	11954.84 ± 5197.83