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.

Kyphosis 12 15 42 52 59 73 82 91 96 105 114 120 121 128 130 139 139 157 No kyphosis 1 1 2 8 11 18 22 31 37 61 72 81 97 112 118 127 131 140 151 159 177 206 Use the Minitab logistic regression output on page 543 to decide whether age appears to have a significant impact on the presence of kyphosis.