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A Methodology for the Health Sciences - part 5

Mặt khác, có thể là một hiệp hội trong mỗi tầng sẽ biến mất trong tập dữ liệu chung. Những con số sau đây minh họa điều này: tầng 1: Tiếp xúc với bệnh | PROBLEMS 349 Table 9.21 Blood Pressure Data for Problem 9.26 Maximal SBP Y Y - Y Normal Deviate Pre Post X Y 163 186 189.90 -3.80 -0.08 216 245 239.16 200 210 224.26 -14.26 -0.32 128 130 157.20 -27.20 -0.61 161 161 -26.94 205 198 228.92 -30.92 -0.69 306 349 322.99 26.01 291 250 309.02 -59.02 -1.31 233 194 255.00 -61.00 -1.36 288 345 306.22 38.77 0.86 254 357 116 155 146.02 8.98 0.20 236 211 257.79 -46.79 -1.04 241 292 262.45 29.55 0.66 176 252 201.91 50.09 1.12 204 258 227.99 30.01 0.67 312 259 328.58 -69.58 -1.55 251 276 271.76 4.24 0.09 256 340 276.42 63.58 1.42 9.27 The maximum oxygen consumption VO2 MAX is measured before X and after Y. Here X 32.53 Y 37.05 x2 2030.7 y2 1362.9 xy 54465 and paired t 2.811. Do tasks c k-ii m n at x 30 35 and 40 p q-ii and t . 9.28 The ejection fractions at rest X and at maximum exercise Y before training is used in this problem. X 0.574 Y 0.556 x2 0.29886 y2 0.30284 xy 0.24379 and paired t -0.980. Analyze these data including a scatter diagram and write a short paragraph describing the change and or association seen. 9.29 The ejection fractions at rest X and after exercises Y for the subjects after training 1 are associated 2 do not change on the average 3 explain about 52 of the variability in each other. Justify statements 1 3 . X 0.553 Y 0.564 x2 0.32541 y2 0.4671 xy 0.28014 and paired t 0.424. Problems 9.30 to 9.33 refer to the following study. Boucher et al. 1981 studied patients before and after surgery for isolated aortic regurgitation and isolated mitral regurgitation. The aortic valve is in the heart valve between the left ventricle where blood is pumped from the heart and the aorta the large artery beginning the arterial system. When the valve is not functioning and closing properly some of the blood pumped from the heart returns or regurgitates as the heart relaxes before its next pumping action. To compensate for this the heart volume increases to pump more blood out since some of it returns . To correct for this open