Table 2.

Characteristics of the patient population as divided by age group. Clinical confounders were derived from electronic patient records. Values are n (%) unless otherwise specified.

Age, yrsPatients, nSexConfounders
FemaleMaleRadiation*ImmunosuppressionHematological DiseaseOsteoporosis
15–243821 (55)17 (45)0 (0)17 (45)0 (0)0 (0)
25–345033 (66)17 (43)1 (2)23 (46)0 (0)0 (0)
35–447428 (38)46 (62)2 (3)38 (51)0 (0)2 (3)
45–547539 (52)36 (48)10 (13)46 (61)0 (0)6 (8)
55–646434 (53)30 (47)13 (20)34 (53)1 (2)0 (0)
65–749943 (43)56 (57)13 (13)40 (40)1 (1)7 (7)
≥ 755423 (43)31 (57)9 (17)24 (44)0 (0)6 (11)
All454221 (49)233 (51)48 (11)222 (49)2 (< 1)21 (5)
  • * Radiation of lower spine or pelvic region.

  • Administration of any immunosuppressive agent, including chemotherapy.