Table 2

Spearman’s rank-order and partial correlations between urinary iodine concentration, estimated salt intake and body size, SAGE South Africa Wave 2 (2015)

		All n=456	Men n=110	Women n=346
Correlations with spot UIC (µg/L)
Salt intake (g/day)	r	0.166***	0.164	0.153**
	p	0.000	0.088	0.004
24-hour iodine (µg/day)	r	0.423***	0.483***	0.392***
	p	0.000	0.000	0.000
BMI (kg/m²)	r	0.036	0.001	0.096
	p	0.448	0.988	0.076
Weight (kg)	r	0.043	0.035	0.056
	p	0.365	0.716	0.299
Waist circumference (cm)	r	0.001	0.027	0.008
	p	0.991	0.784	0.878
Hip circumference (cm)	r	0.040	0.213*	0.008
	p	0.389	0.026	0.883
Correlations with 24-hour UIE (µg/day)
Salt intake (g/day)	r	0.552***	0.504***	0.561***
	p	0.000	0.000	0.000
BMI (kg/m²)	r	0.092	0.030	0.168**
	p	0.051	0.758	0.002
Weight (kg)	r	0.130**	−0.023	0.193***
	p	0.005	0.814	0.000
Waist circumference (cm)	r	0.032	−0.011	0.069
	p	0.491	0.911	0.200
Hip circumference (cm)	r	0.052	0.056	0.094
	p	0.269	0.563	0.080

Correlations between iodine and body size controlled for salt intake.
Correlation is significant at the *p<0.05 level; **p<0.01 level; or ***p<0.001 level.
BMI, body mass index; SAGE, Study on global AGEing and adult health; UIC, spot urinary iodine concentration; UIE, 24-hour urinary iodine excretion.