Table 1 Logistic regression results for each variable.

Meal gender

yes

148 (75.51)

232 (76.06)

0.99

0.332

(−0.672, 0.628)

0.947

no

48 (24.49)

73 (23.93)

Wet Rales

yes

141 (71.94)

215 (70.49)

0.87

0.302

(−0.728, 0.456)

0.653

no

55 (29.06)

90 (29.51)

Smoking

yes

123 (62.76)

222 (72.79)

1.25

0.306

(−0.38, 0.819)

0.472

no

73 (37.25)

83 (27.21)

Consciousness Disorder

yes

122 (62.24)

213 (69.84)

1.28

0.730

(−1.184, 1.676)

0.736

no

74 (37.76)

92 (30.16)

Dysphagia

yes

103 (52.55)

226 (74.09)

0.13

0.320

(−2.696, −1.441)

0.000

no

93 (47.45)

32 (10.49)

Epilepsy

yes

167 (85.20)

226 (74.10)

0.66

0.339

(−1.076, 0.252)

0.224

no

29 (14.80)

79 (25.90)

Viscous sputum

yes

147 (75.0)

265 (86.89)

0.62

0.328

(−1.121, 0.163)

0.144

no

49 (25.00)

40 (13.115)

Upper Respiratory Tract Structural Abnormalities (URSA)

yes

191 (97.45)

264 (86.56)

0.10

0.642

(−3.584, −1.069)

0.000

no

5 (2.551)

41 (13.44)

Hypertension

yes

106 (54.08)

160 (52.46)

0.73

0.301

(−0.898, 0.282)

0.306

no

90 (45.918)

145 (47.54)

Coronary Heart Disease

yes

190 (96.94)

292 (95.74)

1.69

0.696

(−0.839, 1.888)

0.451

no

6 (3.06)

13 (4.26)

Diabetes Mellitus

yes

166 (84.69)

247 (80.98)

1.07

0.367

(−0.651, 0.787)

0.853

no

30 (15.31)

58 (19.02)

Pulmonary Infection

yes

167 (85.20)

248 (81.31)

1.78

0.372

(−0.15, 1.306)

0.12

no

29 (14.796)

57 (18.69)

Pulmonary Embolism

yes

186 (94.90)

274 (89.84)

0.40

0.536

(−1.969, 0.133)

0.087

no

10 (5.10)

10 (3.28)

Pulmonary Contusion

yes

182 (92.85)

295 (96.72)

1.09

0.594

(−1.079, 1.252)

0.884

no

14 (7.14)

31 (10.16)

Mental Disorders

yes

175 (89.29)

294 (96.39)

2.99

0.560

(−0.002, 2.193)

0.05

no

21 (10.71)

11 (3.61)

Disease Duration

DD ≤ 30 days

3 (1.53)

42 (13.77)

1.57

0.150

 (0.16, 0.747)

0.002

30 days < DD ≤ 60 days

71 (36.22)

110 (36.07)

60 days < DD ≤ 90 days

56 (28.57)

60 (19.67)

DD > 90 days

66 (33.67)

93 (30.49)

Primary Disease

Cerebral Trauma

69 (35.20)

81 (26.56)

0.78

0.071

 (−0.383, −0.106)

0.001

Cerebral Hemorrhage

78 (39.80)

124 (40.66)

Cerebral Infarction

21 (10.71)

39 (12.79)

Subarachnoid Hemorrhage

4 (2.04)

3 (0.98)

Ischemic Hypoxic Brain Disease

5 (2.55)

17 (5.57)

Central Nervous System Infectious Diseases

3 (1.53)

7 (2.30)

Spinal Cord Injury

7 (3.57)

14 (4.59)

Other Diseases

9 (4.59)

20 (6.56)

Limb Paralysis

Quadriplegia

133 (67.86)

265 (86.89)

0.20

0.351

 (−2.319, −0.943)

0.000

Hemiplegia

63 (32.14)

40 (13.11)

Paraplegia

0 (0)

0 (0)

Sputum Culture Pathogens

Pseudomonas aeruginosa

35 (17.85)

76 (24.92)

1.12

0.047

 (0.025, 0.21)

0.013

Klebsiella pneumoniae subtype

10 (5.10)

23 (7.54)

Acinetobacter baumannii

12 (6.12)

18 (5.90)

Escherichia coli

5 (2.55)

9 (2.95)

Serratia marcescens

1 (0.51)

9 (2.95)

Other Pathogens

12 (6.12)

15 (4.92)

Two or more pathogens

64 (32.65)

79 (25.90)

None

57 (29.08)

76 (24.92)

Age (year)

51.2[17.17]

54.18[16.40]

0.99

0.009

 (−0.027, 0.009)

0.342

GCS

12.69[3.17]

9.82[3.81]

1.24

0.106

 (0.01, 0.427)

0.040

Procalcitonin (ng/ml)

0.12[0.18]

0.32[1.24]

0.46

0.576

 (−1.914, 0.344)

0.173

Interleukin 6 (pg/ml)

16.88[19.67]

41.21[63.13]

0.98

0.007

 (−0.028, −0.002)

0.023

High-Sensitivity C-Reactive Protein (mg/L)

18.98[23.04]

33.52[37.04]

1.00

0.006

 (−0.012, 0.011)

0.963

White Blood Cell Count (10⁹/L)

8.58[3.03]

10.01[5.54]

1.02

0.073

 (−0.119, 0.166)

0.746

Neutrophils (10⁹/L)

6.1[2.78]

7.44[3.43]

0.90

0.090

 (−0.28, 0.073)

0.249

Lymphocytes (10⁹/L)

1.68[0.69]

1.53[0.66]

1.56

0.223

 (0.008, 0.884)

0.046

Monocytes (10⁹/L)

0.56[0.25]

0.62[0.27]

0.68

0.632

 (−1.623, 0.853)

0.542

Hemoglobin (g/L)

111.79[14.48]

107.06[15.75]

1.00

0.010

 (−0.019, 0.021)

0.912

Albumin (g/L)

35.89[3.36]

34.04[4.68]

1.07

0.038

 (−0.008, 0.141)

0.081