HastieandTibshirani(1990,p.282)describedastudytodetermineriskfactors forkyphosis, whichissevereforwardflexionofthespinefollowingcorrective spinalsurgery.Theageinmonthsatthetimeoftheoperationforthe18subjects for whom kyphosis was present were 12, 15, 42, 52, 59, 73, 82, 91, 96, 105, 114, 120, 121, 128, 130, 139, 139, 157 and for the 22 subjects for whom kyphosis was absent were 1, 1, 2, 8, 11, 18, 22, 31, 37, 61, 72, 81, 97, 112, 118, 127, 131, 140, 151, 159, 177, 206.
哈斯蒂安·蒂布希拉尼(1990年,第282頁)描述了一個研究確定基福症的危險因素,即脊柱矯正脊柱手術後的嚴重前向彎曲。18名受試者在手術的年代是12歲 15, 42, 52, 59, 73, 82, 91, 96, 105, 114, 120, 121, 128, 130, 139, 139, 157 和 22 科目誰缺席是 1, 1, 2, 8, 11, 18, 22, 31, 37, 61, 72, 81, 97, 112, 118, 127, 131, 140, 151, 159, 177, 206.
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