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. 2022 Feb 5;4(2):e661–e678. doi: 10.1016/j.asmr.2021.12.009

Appendix Table 3.

Logistic Regression of Variables Associated with Achieving SCB at 6 Months and 1 Year

Questionnaire Factor 6 Months
 12 Months
Univariate Multivariate OR (95% CI) Univariate Multivariate OR (95% CI)
IKDC Sex .860 .897 (.270 – 2.988)
Age .446 .975 (.914 – 1.040)
BMI .477 .972 (.898 – 1.052)
WC .930 1.118 (.095 – 13.150)
Age at First Instability Event .562 1.023 (.948 – 1.103)
Number of Instability Events .253 .954 (.880 – 1.034)
Preoperative PRO Score .010 .954 (.921 – .989)
KOOS Symptoms Sex 1.000 1.000 (.244 – 4.097) predicts success perfectly
Age .536 .976 (.904 – 1.054) .845 1.011 (.903 – 1.133)
BMI .298 1.050 (.958 – 1.150) .313 1.075 (.934 – 1.237)
WC 1.000 1.000 (.059 – 17.065) predicts success perfectly
Age at First Instability Event .652 .983 (.912 – 1.059) .970 .998 (.887 – 1.122)
Number of Instability Events .392 1.041 (.949 – 1.142) .838 1.012 (.902 – 1.135)
Preoperative PRO Score .002 .930 (.888 – .975) .010 .856 (.761 – .963)
KOOS Pain Sex .047 .333 .435 (.081 – 2.347) .438 .545 (.118 – 2.526)
Age .764 1.014 (.927 – 1.109) .072 .801 1.025 (.845 – 1.244)
BMI .242 1.078 (.951 – 1.222) .045 .692 1.032 (.883 – 1.206)
WC predicts success perfectly .695 1.769 (.102 – 30.709)
Age at First Instability Event .247 1.064 (.958 – 1.181) .057 .732 1.039 (.836 – 1.291)
Number of Instability Events .251 .955 (.883 – 1.033) .708 .982 (.890 – 1.082)
Preoperative PRO Score .021 .072 .958 (.914 – 1.004) .003 .009 .892 (.819 – .972)
KOOS ADL Sex .191 .232 (.026 – 2.070) .885 1.123 (.235 – 5.359)
Age .791 .988 (.906 – 1.078) .426 1.046 (.936 – 1.170)
BMI .069 .469 1.042 (.932 – 1.166) .321 1.065 (.941 – 1.204)
WC .477 2.818 (.162 – 49.008) .513 .385 (.022 – 6.757)
Age at first instability event .591 1.022 (.943– 1.108) .065 .409 .958 (.866– 1.060)
Number of instability events .622 .973 (.874 – 1.084) .298 .917 (.780– 1.079)
Preoperative PRO score .003 .007 .937 (.894 – .983) .007 .004 .924 (.876– .975)
KOOS Sport Sex .295 .309 (.034 –2.791) .716 .750 (.159– 3.532)
Age .692 .981 (.894 –1.077) .371 1.048 (.946 – 1.161)
BMI .638 1.024 (.928 – 1.130) 0.267 1.057 (.959 – 1.164)
WC predicts success perfectly predicts success perfectly
Age at first instability event .591 1.024 (.940 – 1.114) 0.475 1.038 (.937 – 1.151)
Number of instability events .670 .975 (.870 – 1.094) .771 .985 (.892 – 1.089)
Preoperative PRO score .035 .956 (.917 – .997) .013 .944 (.901 – .988)
KOOS QOL Sex .888 .896 (.194 – 4.145) predicts success perfectly collinearity
Age .322 .957 (.876 – 1.044) .712 1.032 (.875 – 1.216)
BMI .712 .982 (.892 – 1.080) .854 1.015 (.865 – 1.190)
WC predicts success perfectly predicts success perfectly
Age at First Instability Event .164 .931 (.844 – 1.029) .444 1.074 (.895 – 1.289)
Number of Instability Events .412 1.032 (.957 – 1.112) .975 1.002 (.859 – 1.170)
Preoperative PRO Score .051 .952 (.906 – 1.000) .522 1.025 (.951 – 1.105)
Kujala Function Sex predicts success perfectly collinearity
Age .186 .859 (.686– 1.076)
BMI .242 .844 (.636– 1.121)
WC .858 .750 (.032– 17.506)
Age at first instability event .165 .833 (.643– 1.078)
Number of instability events .753 1.089 (.639–1.856)
Preoperative PRO score .296 1.04 (.967– 1.118)
Kujala Symptoms Sex .856 1.143 (.269 – 4.859) predicts success perfectly
Age .051 .013 .862 (.766 – .970) .186 .859 (.686– 1.076)
BMI .298 .957 (.881 –1.040) .242 1.076 (.636–1.121)
WC .094 .234 .182 (.011 –3.000) .858 .75 (.032– 17.506)
Age at first instability event .214 .947 (.870 – 1.032) .165 .833 (.643 – 1.078)
Number of instability events .188 .976 (.942 – 1.012) .753 1.089 (.639 – 1.856)
Preoperative PRO score .043 .007 .931 (.884 – .980) .296 1.04 (.967– 1.118)
KOOS JR Pain Sex .110 .335 (.088 – 1.282) .356 .556 (.159 – 1.935)
Age .243 .956 (.887 – 1.031) .582 1.024 (.941 – 1.115)
BMI .564 1.022 (.948– 1.102) .529 1.027 (.945 – 1.117)
WC .757 1.474 (.126– 17.184) .848 1.318 (.078 –22.263)
Age at First Instability Event .724 .987 (0.916– 1.062) .300 1.054 (.954 –1.164)
Number of Instability Events .529 .985 (.941 –1.032) .862 .994 (.926– 1.067)
Preoperative PRO score .001 .912 (.864 –.964) .008 .930 (.881– .981)
KOOS JR Symptoms Sex .110 .335 (.088 –1.282) .726 .788 (.208– 2.989)
Age .243 .956 (.887– 1.031) .952 1.003 (.915 –1.099)
BMI .564 1.022 (.948– 1.102) .195 1.061 (.970 –1.159)
WC .757 1.474 (.126– 17.184) .545 2.400 (.141 –40.934)
Age at first instability event .724 .987 (.916 – 1.062) .191 1.071 (.966– 1.188)
Number of instability events .529 .985 (.941– 1.032) .476 .961 (.860– 1.073)
Preoperative PRO score .001 .912 (.864– .964) .002 .822 (.728– .928)
KOOS JR ADL Sex .235 .439 (.113– 1.706) .384 .558 (.149– 2.080)
Age .385 .966 (.893– 1.044) .733 1.015 (.930 – 1.108)
BMI .262 1.045 (.967– 1.129) .297 1.047 (.960 – 1.141)
WC .626 1.844 (.157– 21.650) .675 1.833 (.108 – 31.088)
Age at first instability event .721 .986 (.911 – 1.067) .223 1.065 (.962 – 1.178)
Number of instability events .583 .986 (.940 – 1.036) .994 1.000 (.931 – 1.074)
Preoperative PRO score .005 .929 (.883 – .978) .002 .892 (.830 – .958)

Bold indicates significant value (P < .05 and OR does not cross 1.0). All univariate and multivariate analyses reported as P values. The odds ratio is reported for multivariate regression if significant, otherwise corresponds to univariate regression. OR, odds ratio; 95% CI, 95% confidence interval; SCB, substantial clinical benefit; IKDC, International Knee Documentation Committee; KOOS, Knee Injury and Osteoarthritis Outcome Score; ADL, activities of daily living; QOL, quality of life; JR, joint replacement; BMI, body mass index; WC, workers’ compensation; PRO, patient-reported outcome.