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Table 1 Patient characteristics before and after propensity score matching (PSM)

From: Clinical value of CT-based patient-specific 3D preoperative design combined with conventional instruments in primary total knee arthroplasty: a propensity score-matched analysis

Characteristics

Before PSM (n = 398)

After PSM (n = 218)

Conventional group (n = 202)

Novel technique group (n = 196)

P

Conventional group (n = 109)

Novel technique group (n = 109)

P

Gender (male to female)

31:171

52:144

0.006b

20:89

25:84

0.403b

Side (left to right)

101:101

95:101

0.760b

53:56

52:57

0.892b

Ethnicity (Han to other)

198:4

188:8

0.351b

106:3

105:4

1.000b

Etiology (OA to RA to others)

165:31:6

182:11:3

0.003b

104:4:1

97:10:2

0.180b

Age (1:2:3:4:5)

16:68:101:14:3

5:11:78:86:16

< 0.001b

1:14:77:14:3

5:11:75:15:3

0.573b

BMI (kg/m2)

25.43 ± 3.31

25.60 ± 3.23

0.604a

25.56 ± 3.34

25.60 ± 3.42

0.937a

Hb preoperative (g/L)

127.25 ± 14.53

130.90 ± 14.46

0.013a

130.68 ± 12.36

130.28 ± 14.61

0.830a

HKA preoperative (degree)

− 6.86 ± 10.60

− 9.39 ± 8.79

0.010a

− 9.17 ± 10.05

− 9.30 ± 8.60

0.916a

  1. Age is divided into 5 levels, level 1: < 50 years, level 2: 50–59 years, level 3: 60–69 years, level 4: 70–79 years, level 5: > 79 years
  2. aStands for t test
  3. bStands for chi-squared test