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Table 1 Baseline characteristics before and after 1:2 matching

From: Robotics versus personalized 3D preoperative planning in total knee arthroplasty: a propensity score-matched analysis

Characteristics Before PSM
(n = 248)
After PSM
(n = 156)
3D preoperative planning group
(n = 196)
Robotics group
(n = 52)
P value 3D preoperative planning group
(n = 104)
Robotics group
(n = 52)
P value
Gender (male/female) 52:144 11:41 0.428b 23:81 11:41 0.891b
Side (left/right) 95:101 31:21 0.153b 61:43 31:21 0.908b
Age (years) 69.3 ± 8.4 66.1 ± 7.9 0.016a 66.9 ± 9.4 66.1 ± 7.9 0.585a
BMI (kg/m2) 25.6 ± 3.2 26.0 ± 4.2 0.472a 26.0 ± 3.5 26.0 ± 4.2 0.988a
Pre-HKA (°) 170.6 ± 8.8 172.4 ± 6.4 0.110a 172.1 ± 9.1 172.4 ± 6.4 0.857a
  1. PSM, propensity score matching; BMI, body mass index; and HKA, hip–knee–ankle angle
  2. aStands for t test, and bStands for χ2 test. P value in bold indicates statistical significance