Skip to main content

Table 1 Characteristic at baseline between A and B group

From: A nomogram to predict the risk of prolonged length of stay following primary total hip arthroplasty with an enhanced recovery after surgery program

 

Total

A group

B group

P value

Number of patients

392

203

189

 

Age (years)

61.2 (7.0)

58.0 (6.8)

64.6 (5.5)

< 0.001

Sex (%)

 Female

186 (47.4)

75 (36.9)

111 (58.7)

0.04

 Male

206 (52.6)

128 (63.1)

78 (41.3)

 

BMI (kg/m2)

25.2 (1.8)

25.0 (1.6)

25.3 (2.0)

0.373

Harris score

44.2 (15.2)

45.4 (12.8)

42.8 (17.4)

0.523

Hip deformities (%)

 No

334 (85.2)

157 (77.3)

177 (93.7)

0.035

 Yes

58 (14.8)

46 (22.7)

12 (6.3)

 

Hip joint mobility (°)

223.6 (28.0)

230.0 (27.1)

216.8 (27.3)

0.008

Preoperative VAS

6.0 (2.0)

5.6 (1.9)

6.5 (2.1)

0.012

Preoperative Hb (g/L)

134.7 (16.8)

139.0 (12.9)

130.0 (19.2)

0.003

Preoperative ALB (g/L)

44.6 (5.1)

44.0 (5.2)

45.3 (4.9)

0.227

ASA (%)

 I

18 (4.6)

15 (7.4)

3 (1.6)

0.337

 II

213 (54.3)

119 (58.6)

94 (49.7)

 

 III

150 (38.3)

66 (32.5)

84 (44.4)

 

 IV

11 (2.8)

3 (1.5)

8 (4.2)

 

Operation time (min)

74.4 (16.4)

67.8 (12.9)

81.6 (16.7)

< 0.001

Anesthesia time (min)

95.1 (22.3)

87.6 (18.5)

103.2 (23.2)

< 0.001

Intraoperative infusion volume (ml)

372.0 [334.0, 438.0]

337.0 [317.0, 354.0]

440.0 [414.0, 475.0]

< 0.001

Intraoperative blood loss (ml)

182.0 [146.0, 210.0]

182.0 [151.0, 203.0]

183.0 [145.0, 222.0]

0.442

Out of bed activities time (h)

16.4 [13.1, 20.9]

13.6 [11.2, 15.8]

20.9 [17.5, 23.7]

< 0.001

Postoperative infusion volume (ml)

502.0 [474.0, 537.0]

485.0 [466.0, 512.0]

529.0 [481.0, 585.0]

< 0.001

Total infusion volume on the day of surgery (ml)

1050.1 (127.4)

962.4 (80.1)

1144.2 (98.3)

< 0.001

VAS score on the day of surgery

2.8 (0.9)

2.5 (0.9)

3.2 (0.8)

< 0.001

Day 1 after surgery VAS score

3.3 (1.0)

2.7 (0.5)

3.9 (1.1)

< 0.001

POD Hb (g/L)

121.6 (13.7)

123.1 (14.9)

120.1 (12.2)

0.237

POD ALB (g/L)

39.1 (4.6)

40.7 (4.6)

37.4 (4.1)

< 0.001

POD CRP (mg/L)

18.2 (5.2)

18.3 (5.4)

18.1 (5.1)

0.936

POD IL-6 (pg/ml)

20.8 (8.1)

16.5 (6.4)

25.5 (7.2)

< 0.001

POD total blood loss 1 day after surgery (ml)

308.8 (58.7)

298.5 (55.7)

319.8 (59.9)

0.044

POD Hb change rate (%)

9.0 [8.0, 11.0]

8.0 [6.0, 9.0]

10.0 [9.0, 12.0]

< 0.001

  1. A group: LOS ≤ 48 h group; B group: LOS > 48 h group; BMI, body mass index; VAS: visual analogue score; Hb: hemoglobin; ALB: albumin; ASA: American Society of Anesthesiologists; CRP: C-reactive protein; IL-6: interleukin-6; POD: one day after surgery
  2. POD Hb change = (Preoperative Hb − POD Hb)/Preoperative Hb * 100%