Table 1 Comparison of underlying diseases in elderly bedridden patients with hip fracture and lower respiratory tract infection

n (%)/M ± SD

n = 101

n = 46

n = 23

n = 32

Complicated with underlying diseases

94 (93.1%)

42 (91.3%)

22 (95.7%)

30 (93.8%)

0.785

Number of underlying diseases

3.06 ± 1.70

2.27 ± 1.47

3.48 ± 1.38

3.88 ± 1.76

< 0.001

High blood pressure

68 (67.3%)

26 (56.5%)

19 (82.6%)

23 (71.9%)

0.075

Cerebrovascular disease

57 (56.4%)

14 (30.4%)

21 (91.3%)

22 (68.8%)

< 0.001

Anemia

51 (50.5%)

23 (50%)

12 (52.2%)

16 (50%)

0.983

Coronary heart disease

40 (39.6%)

9 (19.6%)

13 (56.5%)

18 (56.3%)

< 0.001

Diabetes

25 (24.8%)

9 (19.6%)

9 (39.1%)

7 (21.9%)

0.168

Alzheimer’s disease

24 (24.0%)

7 (15.6%)

4 (17.4%)

13 (40.6%)

0.035

Arrhythmia

21 (20.8%)

1 (2.2%)

7 (30.4%)

13 (40.6%)

< 0.001

Tumor history

16 (15.8%)

6 (13%)

3 (13%)

7 (21.9%)

0.533

Respiratory diseases

14 (13.9%)

10 (21.7%)

1 (4.3%)

3 (9.4%)

0.130

Smoking history

14 (13.9%)

1 (2.2%)

8 (34.8%)

5 (15.6%)

< 0.001

History of fragile fracture

20 (19.8%)

8 (17.4%)

2 (8.7%)

10 (31.3%)

0.101

Chronic respiratory failure

5 (5.0%)

4 (8.7%)

0 (0)

1 (3.1%)

0.370

Chronic cardiac insufficiency

4 (4.0%)

1 (2.2%)

0 (0)

3 (9.4%)

0.199

Parkinson’s syndrome

4 (4%)

2 (4.3%)

0 (0)

2 (6.3%)

0.685

Long-term oral hormones

3 (3%)

3 (6.5%)

0 (0)

0 (0)

0.318

Indwelling urinary catheters

36 (35.6%)

11 (23.9%)

10 (43.5%)

15 (46.9%)

< 0.001

Long-term nasal feeding

35 (34.7%)

7 (15.2%)

9 (39.1%)

19 (59.4%)

0.077