Research Article

Decision Tree Analysis: A Retrospective Analysis of Postoperative Recurrence of Adhesions in Patients with Moderate-to-Severe Intrauterine

Table 1

Attribute variables or category descriptions of factors influencing the recurrence of intrauterine adhesions.

Data typeEncoding

Recurrence of adhesionsBinary classificationNo; yes

Age (y)Continuous variable
Times of pregnancyFrequency
ChildbirthBinary classificationNo; yes
Menstrual patternQuadruple classificationz = 0, a ≤ 1/4, b = 1/4–1/2, c ≥ 1/2

EtiologyTripartite classificationa = termination of early pregnancy; b = termination of mid-late pregnancy; c = nonpregnancy-related factors

Pregnancies lost (n)Tripartite classificationz = 0, a = 1, b ≥ 2
Intrauterine operations (n)Frequency

Previous TCRABinary classificationNo; yes
Endometrial thickness (mm)Tripartite classificationa ≤ 3 mm, b = 4–6 mm, c = ≥7 mm

Uterine volume (cm3)Continuous variable
AFS scoreContinuous variable

Degree of adhesionTwo classificationsa = moderate intrauterine adhesions, b = severe intrauterine adhesions

Adhesion typeTwo classificationsa = mixed type, b = peripheral type
Intrauterine depthContinuous variable

Uterine horn closureTripartite classificationz = 0 side, a = 1 side, b = 2 sides
Tubal ostiaTripartite classificationz = 0 side, a = 1 side, b = 2 sides

Isolation barrierTripartite classificationa = Foley balloon, b = intrauterine suitable balloon, c = intrauterine contraceptive device