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Table 1 Characteristics of the study population grouped by indication

From: Leveraging machine learning for duration of surgery prediction in knee and hip arthroplasty – a development and validation study

 

Hip arthroplasty

(N = 2,104)

Knee arthroplasty

(N = 1,600)

Age (years)

  

 Mean (SD)

66.3 (10.4)

67.0 (9.0)

 Median [Min, Max]

67.0 [20.0, 93.0]

67.0 [35.0, 87.0]

Male

  

 Mean (SD)

0.46 (0.50)

0.47 (0.50)

 Median [Min, Max]

0 [0, 1.00]

0 [0, 1.00]

Body mass index

  

 Mean (SD)

28.0 (5.6)

30.6 (5.9)

 Median [Min, Max]

27.0 [16.5, 114.0]

29.5 [8.0, 64.9]

Weight

  

 Mean (SD)

83.4 (18.6)

90.9 (19.5)

 Median [Min, Max]

81.0 [45.0, 193]

89.0 [45.0, 176]

Height

  

 Mean (SD)

172 (9.8)

172 (10.2)

 Median [Min, Max]

172 [81, 200]

172 [146, 250]

Charlson weighted score

  

 Mean (SD)

0.42 (0.82)

0.42 (0.76)

 Median [Min, Max]

0 [0, 6.0]

0 [0, 5.0]

EQ-5D-5 L

  

 Mean (SD)

0.59 (0.26)

0.62 (0.25)

 Median [Min, Max]

0.67 [-0.46, 1.00]

0.72 [-0.29, 1.00]

EQ-VAS

  

 Mean (SD)

56.0 (19.8)

57.8 (19.4)

 Median [Min, Max]

57.5 [0, 100]

60.0 [0, 100]

HOOS-PS/KOOS-PS

  

 Mean (SD)

47.3 (16.0)

42.5 (12.1)

 Median [Min, Max]

46.1 [0, 100]

40.3 [5.6, 100]

DOS (mins)

  

 Mean (SD)

55.9 (21.7)

62.0 (20.5)

 Median [Min, Max]

51.0 [24, 180]

58.0 [20, 180]

  1. 1As especially many patients had DOS of 90 min (upper quantile), the high DOS group was substantially smaller than the low DOS group
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BMC Medical Informatics and Decision Making

ISSN: 1472-6947

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