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Table 6 Quantile regression for potassium and sodium intakes, considering socioeconomic variables (coefficient signs and p-values)

From: Low potassium and high sodium intakes: a double health threat to Cape Verdeans

Variables (reference)

Potassium Intake

Sodium Intake

Q1

Q2

Q3

Q1

Q2

Q3

(Intercept)

0.001

0.000

0.000

0.001

0.000

0.000

Gender (men)

1.000

(−)0.000

(−)0.000

(−)0.000

(−)0.000

1.000

Urban area (formal)

0.295

0.155

(+)0.027

(+)0.010

(+)0.001

(+)0.000

Age

0.160

0.738

0.430

0.512

(−)0.042

(−)0.026

Academic qualifications (None and preschool)

 Primary

0.095

0.103

0.214

0.659

0.876

0.256

 Secondary

(+) 0.003

(+)0.004

(+)0.028

0.291

0.850

0.274

 High school

(+) 0.000

(+)0.000

(+)0.000

1.000

1.000

(−)0.000

Professional Status (Employed)

 Unemployed

(+) 0.050

0.477

0.437

0.147

0.588

0.068

  1. Q1, 25th percentile; Q2, median; Q3, 75th percentile
  2. Values that are statistically significant at the 5% level are marked in bold