Table 1 Demographic data on patients in the unilateral and staged bilateral TKA groups

Age (years)

71.3(range, 55–84; SD, 6.3)

71.5 (range, 53–84; SD, 6.4)

Proportion of female patients

45 (84.9)^*

85 (85)^*

BMI (kg/m²)

26.9 (range, 20.9–44.8; SD, 4.1)

27.2 (range, 18.6–36; SD, 3.7)

Proportion undergoing general anesthesia

45 (84.9)^*

95 (95)^*

Operation time (min)

95.4 (range, 66–175; SD, 19)

91.2 (range, 43–140; SD, 16.2)

Length of hospital stay (days)

13.9 (range, 8–23; SD 2.7)

20.7 (range, 11–32; SD 3.9)

Number of comorbidities^a

1.4 (range, 0–5; SD, 1.0)

1.3 (range, 0–4; SD, 1.1)