Table 2 Bivariable and multivariable analysis of prolonged LOS (> 13 days) among patients who underwent orthopedic surgery atTibebe Ghion Specialized Hospital, Northwest Ethiopia

Preoperative anemia status

Non-anemic

390 (52.21)

88 (41.51)

1, ref

1, ref

Anemic

357 (47.79)

124 (58.49)

1.53 (1.13, 2.09)

1.77 (1.25, 2.50)*

Age (in years)^a

30 (23, 45)

32 (25, 50)

1.01 (1.00, 1.02)

1.00 (0.99, 1.01)

Sex

Male

565 (75.64)

171 (80.66)

1, ref

1, ref

Female

182 (24.36)

41 (19.34)

0.74 (0.50, 1.08)

0.90 (0.60, 1.36)

ASA physical status score

I/II

723 (96.79)

199 (93.87)

1, ref

1, ref

III/IV

24 (3.21)

13 (6.13)

1.96 (0.98, 3.93)

0.65 (0.25, 1.71)

Comorbidity

Yes

117 (15.66)

52 (24.53)

1.75 (1.20, 2.53)

2.42 (1.47, 4.15)*

No

630 (84.34)

160 (75.47)

1, ref

1, ref

Urgency of surgery

Elective

330 (44.18)

74 (34.91)

1, ref

1, ref

Emergency

417 (55.82)

138 (65.09)

1.74 (1.07, 2.02)

1.18 (0.83, 1.67)

Trauma

Yes

533 (71.35)

153 (72.17)

1.04 (0.74, 1.46)

1.12 (0.77, 1.64)

No

214 (28.65)

59 (27.83)

1, ref

1, ref

Type of anesthesia

General

130 (17.40)

40 (18.87)

1.10 (0.74, 1.63)

0.93 (0.61, 1.43)

Regional

617 (82.60)

172 (81.13)

1, ref

1, ref

Length of surgery

 < 2 h

540 (72.29)

145 (68.40)

1, ref

1, ref

 ≥ 2 h

207 (27.71)

67 (31.60)

1.04 (0.74, 1.42)

0.94 (0.64, 1.39)

Bloss loss (milliliters)

 < 500

657 (87.95)

165 (77.83)

1, ref

1, ref

 ≥ 500

90 (12.05)

47 (22.17)

2.07 (1.40, 3.07)

1.63 (0.92, 2.88)

Blood transfusion

Yes

82 (10.98)

29 (13.68)

1.28 (0.81, 2.02)

0.90 (0.49, 1.68)

No

665 (89.02)

183 (86.32)

1, ref

1, ref