Kyphosis refers to severe forward flexion of the spine following corrective spinal surgery. A study carried out to determine risk factors for kyphosis reported the accompanying ages (months) for 40 subjects at the time of the operation; the first 18 subjects did have kyphosis and the remaining 22 did not.

Use the Minitab logistic regression output on the next page to decide whether age appears to have a significant impact on the presence of kyphosis.

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Kyphosis 12 5 42 52 59 73 82 91 96 105 114 120 12 128 130 139 139 157 Na lkyylhs2818 22 31 37 6 7281 97 112 118 127 131 140 5 159 177 206 95% CI predictor constant age Coef -0.5727 0.004296 odds Ratio StDev 0.6024 0.005849 Lower Upper -0.95 0.73 0.342 0.463 1 . 00 0.99 1.02