Table 1.

Household and maternal sociodemographic characteristics of study participants

	Household Salt Disappearance Study	Maternal Salt and Sodium Study
Characteristic	All households (n = 331)	Mothers includeda (n = 104)	Mothers not included (n = 227)	P b
Mother's age (years)	28 (27–29)	28 (27–29)	28 (27–29)	0.89
Household sizec				0.77
≤2 persons	27 (8%)	10 (10%)	17 (8%)
3−6 persons	242 (73%)	74 (71%)	168 (73%)
≥7 persons	62 (19%)	20 (19%)	42 (19%)
Daily per capita incomed				0.39
≤$3.20 USD	284 (86%)	91 (88%)	193 (85%)
>$3.20 USD	47 (14%)	13 (12%)	34 (15%)
Household education levele				0.77
None	10 (3%)	2 (2%)	8 (4%)
Primary school	125 (38%)	37 (36%)	88 (39%)
Lower secondary school	122 (37%)	38 (37%)	84 (37%)
Upper secondary school	56 (17%)	21 (20%)	35 (15%)
Higher education	18 (5%)	6 (5%)	12 (5%)
National Wealth Equity Index quintilef				0.76
Lowest	80 (24%)	23 (22%)	57 (25%)
Second lowest	69 (21%)	21 (20%)	48 (21%)
Middle	107 (32%)	35 (34%)	72 (32%)
Second highest	53 (16%)	15 (14%)	38 (17%)
Highest	22 (7%)	10 (10%)	12 (5%)

Note: Data are presented as n (%) or mean (95% CI).

^a Participants in the Maternal Salt and Sodium Study were randomly selected from the Household Salt Disappearance study.

^b χ² test or Mann–Whitney U test, comparing subsample of mothers (n = 104) with remaining larger sample (n = 227).

^c Includes household members ≥2 years of age.

^d Daily per capita income categorized as below or above the World Bank Lower Middle Poverty Line ($3.20 USD/person/day).

^e Household education level is defined as the highest education level attained within the household (either mother or father).

^f National Wealth Equity Index score is calculated using EquityTool, quintiles standardized to the 2014 Cambodian Demographic and Health Survey¹⁹ (https://www.equitytool.org/cambodia/).