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Table 1 Demographic features of the patients undergoing CD

From: The indications for core decompression surgery in patients with ARCO stage I-II osteonecrosis of the femoral head: a new, comprehensive prediction system

Patient characteristics

 

Total

(n = 1537)

Noncollapsed group

(n = 731)

Collapsed group

(n = 806)

Statistical

value

P

Age (years)

 

43.11 ± 13.13

42 ± 13.60

44.12 ± 12.61

-3.160

0.002

Sex

Male

1211 (78.8%)

511 (69.9%)

700 (86.8%)

65.859

< 0.001

 

Female

326 (21.2%)

220 (30.1%)

106 (13.2%)

  

Body mass index (kg/m²)

 

25.10 ± 3.15

25.18 ± 3.22

25.03 ± 3.10

0.923

0.356

Aetiology

Alcohol-induced

693 (45.1%)

305 (41.7%)

388 (48.1%)

21.890

< 0.001

 

Idiopathic

768 (50%)

404 (55.3%)

364 (45.2%)

  
 

Corticosteroid-induced

76 (4.9%)

22 (3%)

54 (6.7%)

  

Side

Bilateral

1260 (82%)

594 (81.3%)

666 (82.6%)

0.488

0.485

 

Unilateral

277 (18%)

137 (18.7%)

140 (17.4%)

  

Occupation

Weight-bearing

591 (38.5%)

300 (41%)

291 (36.1%)

41.914

< 0.001

 

Sitting

477 (31%)

170 (23.3%)

307 (38.1%)

  
 

Standing

469 (30.5%)

261 (35.7%)

208 (25.8%)

  

Smoker

NO

811 (52.8%)

434 (59.4%)

377 (46.8%)

24.405

< 0.001

 

YES

726 (47.2%)

297 (4.6%)

429 (53.2%)

  

Alcohol use

NO

957 (62.3%)

508 (69.5%)

449 (55.7%)

31.010

< 0.001

 

YES

580 (37.7%)

223 (30.5%)

357 (44.3%)

  
  1. *Mann–Whitney U test
  2. #Chi-square test