What nonparametric test could be used to test for the effect of linoleic acid on SBP?

Hypertension

Polyunsaturated fatty acids in the diet favorably affect several risk factors for cardiovascular disease. The principal dietary polyunsaturated fat is linoleic acid. To test the effects of dietary supplementation with linoleic acid on blood pressure, 17 adults consumed 23 g/day of safflower oil, high in linoleic acid, for 4 weeks. Systolic blood pressure (SBP) measurements were taken at baseline (before ingestion of oil) and 1 month later, with the mean values over several readings at each visit given in Table 9.12. 

Table 9.12: Effect of linoleic acid on SBP

  

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Baseline - Subject Baseline SBP 1-month SBP 1-month SBP 119.67 117.33 2.34 98.78 100.00 1.22 3 123.56 123.83 -0.27 4 109.89 107.67 2.22 96.22 95.67 0.55 128.89 133.33 4.44 115.78 113.22 2.56 8. 126.39 121.56 4.83 122.78 -3.55 126.33 10 117.44 110.39 7.05 11 111.33 107.00 4.33 8.89 12 117.33 108.44 120.67 117.00 13 3.67 4.78 14 131.67 126.89 15 92.39 93.06 -0.67 16 134.44 126.67 7.77 17 108.67 108.67 0.00