The Update to the Task Force Report on Blood Pressure Control in Children [14] reported the observed 90th per- centile of SBP in single years of age from age 1 to 17 based on prior studies. The data for boys of average height are given in Table 11.21.

Suppose we seek a more efficient way to display the data and choose linear regression to accomplish this task.

11.18 Fit a regression line relating age to SBP, using the data in Table 11.21

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Table 11.21 90th percentile of SBP in boys ages 1-17 of average height Age (x) SBP (y) Age (x) SBP (y) 99 10 115 102 11 117 105 12 120 107 13 122 5 108 14 125 110 15 127 7 111 16 130 8 112 17 132 9 114 90th percentile for each 1-year age group. 123 4 Table 11.21 90th percentile of SBP in boys ages 1-17 of average height Age (x) SBP (y) Age (x) SBP (y) 99 10 115 102 11 117 105 12 120 107 13 122 5 108 14 125 110 15 127 7 111 16 130 8 112 17 132 9 114 90th percentile for each 1-year age group. 123 4