Chapter 13.2, Problem 24E

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 the next  page to decide whether age appears to have a significant  impact on the presence of kyphosis.

						95%	Cl
Predictor	Coef	StDev	Z	P	Odds Ratio	Lower	Upper
Constant	-0 .5727	0 .6024	-0 .95	0.342
age	0 .004296	0 .005849	0 .73	0.463	1. 00	0.99	1.02