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Table 6 Comparison of sociodemographic, clinical and outcome parameters among patients with arterial blood gases data available at decision making versus those with missing data at that time.

From: The IRYSS-COPD appropriateness study: objectives, methodology, and description of the prospective cohort

 

Patients without missing data

N = 747

Patients with missing data

N = 2130

p value

Age*

72.54 (9.50)

72.94 (9.51)

0.3311

Clinical data previous to arrival at the ED

   

Charlson Index

  

0.5522

   <=1

301 (40.68)

883 (41.93)

 

   >1

439 (59.32)

1223 (58.07)

 

Number of hospital admissions in the previous 12 months for COPD

  

<.0001

   3 or more

128 (17.34)

232 (11.04)

 

   Less than 3

610 (82.66)

1869 (88.96)

 

Basal FEV1%

  

<.0001

   >= 50

169 (25.61)

640 (36.16)

 

   < 50

491 (74.39)

1130 (63.84)

 

Use of oxygen at home - Yes

336 (45.41)

648 (30.84)

<.0001

At arrival at the ED

   

Glasgow Coma Scale - altered

34 (4.55)

43 (2.02)

0.0002

Edema - Yes

153 (21.37)

363 (18.19)

0.0627

Dyspnea upon arrival in the ED - Yes

546 (76.36)

1288 (63.64)

<.0001

PH at arrival

  

<.0001

   >=7.35

462 (69.79)

1679 (91.65)

 

   7.26-7.35

156 (23.56)

137 (7.48)

 

   <7.26

44 (6.65)

16 (0.87)

 

PO2 at arrival

  

<.0001

   >60

229 (35.12)

901 (49.59)

 

   45 - 60

273 (41.87)

706 (38.86)

 

   <=45

150 (23.01)

210 (11.56)

 

Respiratory rate at arrival

  

<.0001

   <20

79 (12.38)

356 (21.24)

 

   20-24

209 (32.76)

623 (37.17)

 

   >24

350 (54.86)

697 (41.59)

 

PCO2 at arrival

  

<.0001

   <=45

243 (36.82)

1122 (61.48)

 

   46-55

165 (25.00)

427 (23.40)

 

   56-65

117 (17.73)

171 (9.37)

 

   >65

135 (20.45)

105 (5.75)

 

Outcome parameters

   

Death

18 (2.41)

42 (1.97)

0.4712

Admission to Intensive Care Unit

14 (1.87)

13 (0.61)

0.0021

Invasive Mechanical Ventilation

16 (2.14)

22 (1.03)

0.0223

Admission to Intermediate respiratory care unit

50 (6.69)

24 (1.13)

<.0001

Noninvasive mechanical ventilation

57 (7.63)

43 (2.02)

<.0001

Chronic oxygen therapy in the medical ward

476 (63.72)

1036 (48.64)

<.0001

Cardiac arrest

6 (0.80)

14 (0.66)

0.6796

  1. *Mean (Std)
  2. Patients were included in the patients with missing data at decision making time group if they did not have the pH data available at that time. If they had it, they were included in the group with no missing data at that time.