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Table 3: Imputations and Coding for Modeling
|
Variable
|
Imputation of Missing Data
|
Coding of Variable for Modeling Purposes
|
|
All continuous variables (age, BMI, length of procedure, uterine volume,
fibroid size)
|
Imputed as medians of the variable
|
Value of the variable itself
|
| |
|
|
Number of fibroids
|
Imputed to 5
|
Value of the variable itself
|
|
Race
|
Imputed as Caucasian/other
|
2 groups for race: Caucasians or others vs. African Americans (reference group)
|
|
History of pregnancy
|
Used data from variables—gravida, para, spontaneous abortion, ectopic—to
define variable. If still missing imputed to "nulligravid"
|
Nulliparous or nulligravid vs. parous
|
|
Smoking
|
Imputed as "non smoker"
|
|
|
Previous procedures
|
Imputed to "none"
|
Any vs. none (ref.)
|
|
Previous medical therapy
|
Imputed to "none"
|
Any vs. none (ref.)
|
|
Fibroid morphology
|
Lumped missing with subserosal & intra/trans mural
|
Submucosal vs. others (ref.)
|
|
Symptoms
|
Missing lumped with other symptoms
|
Heavy bleeding, pelvic pain, bulk vs. others (ref)
|
|
DVT prop.
|
Imputed to "no"
|
yes vs. no (ref)
|
|
Prophylactic antibiotics
|
Imputed to "no"
|
yes vs. no (ref)
|
|
Vessel embolized
|
Excluded patients missing or with no vessel embolized
|
UA bilateral vs. UA single (ref.)
|
|
Core site
|
No requirement
|
yes vs. no (ref)
|
|
Practice type
|
No requirement
|
academic vs. other (ref)
|
|
Site experience
|
Initial no. of cases imputed as 0
|
|
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