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Table 1 Demographic and clinical characteristics of patients

From: Costs of staged versus simultaneous bilateral total knee arthroplasty: a population-based study of the Taiwanese National Health Insurance Database

Ā 

Simultaneous bilateral TKA

Staged bilateral TKAc

pvalue

(nā€‰=ā€‰452)

(nā€‰=ā€‰690)

Age, yearsa

70.0 (65.0, 75.0)

69.0 (62.0, 73.0)

<0.001*

Gender, maleb

98 (21.7)

159 (23.0)

0.641

CCIb

Ā Ā 

0.848

ā€ƒ0

357 (79.0)

549 (79.6)

Ā 

ā€ƒ1

85 (18.8)

123 (17.8)

Ā 

ā€ƒ>1

10 (2.2)

18 (2.6)

Ā 

LOS, daysa

12.0 (9.0, 15.0)

15.0 (12.0, 18.0)

<0.001*

Hospital typeb

Ā Ā 

0.012*

ā€ƒMedical center

210 (46.5)

260 (37.7)

Ā 

ā€ƒRegional hospital

109 (24.1)

187 (27.1)

Ā 

ā€ƒDistrict hospital

133 (29.4)

243 (35.2)

Ā 
  1. CCI, Charlson comorbidity index; LOS, length of stay. aContinuous data were presented as median (IQR) and compared by Mann-Whitney U test; bcategorical variables were expressed by counts and percentages and compared by the Chi-square test or the Fisherā€™s exact test, as appropriate; cdata was that from the first TKA except LOS, which was the summation of two admissions; asterisk indicated a significant difference between groups, pā€‰<ā€‰0.05.