Table 2

Results of univariable and multivariable logistic regression analyses for variables associated with osteonecrosis

Univariable logistic regressionMultivariable logistic regression
With osteonecrosis
(frequency (%))
Without osteonecrosis
(frequency (%))
ORCIp ValueORCIp Value
Age (years)
 <1022 (1)2257 (99)1.00
 10–15111 (18)496 (82)22.9614.38 to 36.64<0.00123.7314.82 to 38.00<0.001
 16–2032 (17)154 (83)21.3112.09 to 37.57<0.00122.4512.66 to 39.81<0.001
 21+3 (7)38 (93)8.102.32 to 28.220.0018.322.38 to 29.120.001
Ethnicity
 White141 (6)2384 (94)1.00
 Black3 (4)71 (96)0.730.23 to 2.350.600.940.27 to 3.230.92
 Asian15 (6)217 (94)1.200.69 to 2.070.531.921.05 to 3.550.04
 Other/unknown11 (4)271 (96)0.910.52 to 1.590.730.990.52 to 1.880.99
 Gender
 Male96 (5)1671 (95)0.910.65 to 1.280.59
 Female74 (5)1272 (95)1.040.76 to 1.430.791.00
Number of delayed intensifications
 2138 (6)2142 (94)1.00
 131 (4)802 (96)0.850.59 to 1.220.380.990.67 to 1.450.94