Table 4

Associations of tertiles of neighbourhood SES score with urinary sodium, potassium and Na–K excretion by sex

	Men						Women
	Sodium (mg/day)		Potassium (mg/day)		Sodium to potassium ratio		Sodium (mg/day)		Potassium (mg/day)		Sodium to Potassium Ratio
	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI
Model 1†‡§¶
Neighbourhood SES
Low	12	−426 to 451	−403**	−628 to 178	0.40**	0.13 to 0.66	42	−217 to 301	−426**	−614 to 238	0.36**	0.16 to 0.56
Middle	64	−410 to 538	−14	−235 to 208	0.13	−0.10 to 0.36	−61	−318 to 195	−425**	−604 to 245	0.27	0.05 to 0.49
High	Reference		Reference		Reference		Reference		Reference		Reference
Model 2‡
Neighbourhood SES
Low	−2	−512 to 508	−101	−236 to 123	0.11	−0.13 to 0.34	−116	−362 to 129	−266**	−446 to 86	0.09	−0.08 to 0.27
Middle	77	−335 to 489	231	−105 to 513	−0.08	−0.33 to 0.17	−156	−416 to 103	−331**	−509 to 152	0.13	−0.04 to 0.30
High	Reference		Reference		Reference		Reference		Reference		Reference
Model 3‡
Neighbourhood SES
Low	−21	−591 to 550	31	−195 to 257	0.05	−0.19 to 0.29	−130	−404 to 144	−244**	−415 to 73	0.04	−0.13 to 0.21
Middle	80	−325 to 486	319	−13 to 651	−0.11	−0.34 to 0.12	−183	−452 to 87	−328**	−507 to 148	0.10	−0.07 to 0.26
High	Reference		Reference		Reference		Reference		Reference		Reference
Model 4‡
Neighbourhood SES
Low	78	−478 to 545	47	−180 to 274	0.04	−0.19 to 0.28	−205	−475 to 64	−251**	−409 to 93	−0.01	−0.19 to 0.16
Middle	168	−347 to 1775	313*	9 to 618	−0.12	−0.35 to 0.11	−227	−478 to 24	−330**	−501 to 19	0.06	−0.11 to 0.24
High	Reference		Reference		Reference		Reference		Reference		Reference

Model 1 is unadjusted; Model two is adjusted for individual-level age and race/ethnicity; Model 3 is additionally adjusted for individual-level education, poverty and employment status; Model 4 is additionally adjusted for physical activity.
Boldface indicates statistical significance *P<0.05, **P<0.01.
†Indicates a significant trend for potassium among men, P<0.05.
‡Indicates a significant trend for potassium among women, P<0.05.
§Indicates a significant trend for Na–K among men, P<0.05.
¶Indicates a significant trend for Na–K among women, P<0.05.
Na:K, sodium to potassium ratio; SES, socioeconomic status.